# Is 72 a prime or composite number?

If the factors of 72 are only 72 and 1, then we know that 72 is a prime number. Otherwise, 72 is a composite number. To explain better, if 72 is only divisible by 1 and 72, then it is a prime number, and if 72 is divisible by more than 72 and 1, then it is a composite number.

For 72, the answer is: No, 72 is not a prime number. The list of all positive divisors (i.e., the list of all integers that divide 72) is as follows: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72.

why is 72 a composite number? A composite number is a number that can be divided evenly by more numbers than 1 and itself. The number 72 can be evenly divided by 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36 and 72, with no remainder. Since 72 cannot be divided by just 1 and 72, it is a composite number.

One may also ask, is 73 a prime or composite number?

When a number has more than two factors it is called a composite number. Here are the first few prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, etc.

What are the factors of 72?

The factors of 72. Answer : 1,2,3,4,6,8,9,12,18,24,36,72, Related Links : Is 72 a rational number?

### What are the prime factors for 72?

Divide 72 by the prime number 2 . 722=36. 36×2=72. 362=18. 18×2=36. 182=9. 9×2=18. 93=3. 3×3=9.

### IS 144 a perfect square?

A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 144 is 12. Therefore, the square root of 144 is an integer, and as a consequence 144 is a perfect square.

### What is the prime factorization of 36?

In the prime factorization of 36 = 2² x 3², the two is used as a factor two times and the three is used as a factor twice. When checking to see if a number is prime or not, you need only divide by those prime numbers that when squared remain less than the given number.

### Is the square root of 72 Irrational?

Thus square root of 72 is not rational.

### Is 81 a perfect square?

A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 81 is 9. Therefore, the square root of 81 is an integer, and as a consequence 81 is a perfect square.

### Why is 73 the best number?

Sheldon: “The best number is 73. Why? 73 is the 21st prime number. Its mirror, 37, is the 12th and its mirror, 21, is the product of multiplying 7 and 3 and in binary 73 is a palindrome, 1001001, which backwards is 1001001.”

### How many prime numbers are there?

There are 25 prime numbers from 1 to 100: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.

### What is a prime number and composite number?

Summary: A prime number has only two factors: 1 and itself. A composite number has more than two factors. The number 1 is neither prime nor composite. The prime numbers between 2 and 31 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 and 31 since each of these numbers has only two factors, itself and 1.

### What is prime and composite numbers in math?

A prime number is a whole number that only has two factors which are itself and one. A composite number has factors in addition to one and itself. The numbers 0 and 1 are neither prime nor composite. All even numbers are divisible by two and so all even numbers greater than two are composite numbers.

### What is the 100th prime number?

An Overview in Numbers 29 is the 10th prime number. 541 the 100th. 7919 is the 1000th, and 1,299,709 is the 100,000th prime.

### Is 0 a prime number?

0 is neither prime, nor composite number. Prime Numbers are numbers greater than 1, because Prime Numbers should have 1 and the number itself, as its factor, which means, it must have only two positive factors. Also, zero has an infinite number of divisors (any nonzero whole number divides zero).

### Is 0 a composite number?

A composite number has factors in addition to one and itself. The numbers 0 and 1 are neither prime nor composite. For example, all even numbers are divisible by two, and so all even numbers greater than two are composite numbers.

### Which is not a prime number?

Nonprime numbers are integers that are not prime numbers, i.e. zero (0), units (e.g. one (1), minus one (–1)), composite numbers and the associates of prime numbers (negated primes). Some nonprime numbers are –2563, 1, 48 and 1729.