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21 = 3x7, and so is not prime, as it can be expressed as the product of multiple prime numbers

Q: Is 21 prime or not prime?

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number 21 is prime

21 is a composite number, not a prime, having prime factors 3x7.

21 has two prime factors.

factors of 21: 3, 7 prime factors of 21: 3, 7

21 is the product of two prime numbers, three and seven. A prime number is defined as a number divisible only by one or itself. So ... NO ... 21 is not a prime number.

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Do you mean, "What is the prime factorization of 21?"

The prime factorization for 21 is 3x7.

21 is not prime.

It can be. 21 is relatively prime with 32.

number 21 is prime

3 * 7 = 21 21 is not prime

The prime factorization for 21 is: 3x73 x 7 = 21

11 is a prime number but 21 is not a prime number as it is divisible by 3.

21 is a composite number, not a prime, having prime factors 3x7.

3 x 7 = 21, since both factors are prime, that is the prime factorization of 21.

21 has two prime factors.

17 is a prime number, but 21 is not (21 = 3 * 7).