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No 21 is not a Prime number because it has more than two factors therefore it is a composite number

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Q: Is 21 one a prime

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21 is a Composite Number. 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. 21 is divisible by 3 and 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.

23 is a prime number.

Only 23 is a prime number.

19 and 23 are prime.

The prime factorization of 21 is: 3 x 7

21 x 2 does not equal 40. 21 is not a prime number.

23

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

The prime factors of 21 are 3,7.

It can be. 21 is relatively prime with 32.

The prime factorization for 21 is 3x7.

21 is not prime.

number 21 is prime

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

3 * 7 = 21 21 is not prime

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

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

47 is a prime number 21 & 87 divisible by 3, and 4 is divisible by 2

The prime factors of 21 are 3 and 7.

21 has two prime factors.

21 is not a prime number.

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

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

21 is not a prime.