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Q: Which number is not a prime or a composite number 21 15 8 and 1?

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21 is a composite number

31 and 61 are prime, the rest composite.

number 21 is prime

Composite

Composite.

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.

Composite, 21=3*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.

27 is composite. 27 = 3 * 3 * 3 = 3315 is composite. 15 = 3 * 521 is composite. 21 = 3 * 723 is a prime number. It is only evenly divisible by itself and one.

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