Is 72 a prime number?

No72 is a composite number.

Composite numbers are numbers that have more than two factors.

The number 72 is divisible by 2 other than 1 and itselfso it meets the definition of a composite number.

Facts about Composite Numbers

Fact 1: Every natural number greater than 1 is either prime or composite. 

Fact 2: 4 is the smallest composite number.

Fact 3: All even numbers greater than 2 are composite numbersas they can at least be divided by 2.

Fact 4: Composite numbers include both even and odd numbers. While all even numbers greater than 2 are compositeodd composite numbers existsuch as 91521etc.

Fact 5: 9 is the smallest odd composite numberas it is divisible by 3.

Fact 6: There can be sequences of consecutive numbers that are all composite. For example2425262728and 29where 24 through 28 are all composite and 29 is the next prime.

Fact 7: Every composite number can be expressed as a product of prime numbers (this is known as its prime factorization). For example60 = 2 × 2 × 3 × 5.

Fact 8: The number of composite numbers is infinite. Just as there are infinitely many primesthere are also infinitely many composites.

Fact 9: There is no largest composite number. There is always a larger composite number for any composite number you can think of.

Fact 10: A composite number always has at least three divisors: 1itselfand at least one other number. This contrasts a prime number with two distinct divisors: 1 and itself.

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