Q: What is 21 a prime or composite?

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21 is composite.

Composite

number 21 is prime

21 is composite. 19 and 23 are prime.

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.

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21 is composite.

21 is composite.

21 is a composite number

Composite

number 21 is prime

21 is composite. 19 and 23 are prime.

3 * 7 = 21 21 is not 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.

21 is a composite number.

One is prime, the other two are composite.

21 is composite as 3 times 7 is 21 31 is prime