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Q: Is 21 prime or a composite number?

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21 is a composite number

number 21 is prime

Composite

Composite, 21=3*7

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

Who says it is? 21 is a composite number!

21 is a composite number.

21 is a composite number.

3 * 7 = 21 21 is not prime

21 is composite number that is a multiple of 3. 31 is a prime number.

19 and 23 are prime numbers whereas 21 is a composite number

1 is not composite or prime.

A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 21 is composite.

21 is a composite number because it has more than two factors

A prime number is any integer evenly divisible by only itself, and the number 1. Since 21 is divisible by 3 and 7, it is a composite number, not a prime number.No, 21 is not a prime number.21 is divisible by 1, 3, 7, & 21No. 21=3*7

21 is a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.

21 is a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.

It is composite because it has more than two factors

It is a composite number because it has more than two factors

21 is composite

21 is composite.

21 is composite.

31 and 61 are prime, the rest composite.

21 is not a prime number.