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A Prime number can only have adivisorof itself and 1.

Both 3 and 7 divide 21, so it cannot be a prime number.

I.e.: 21/3 = 7 and 21/7 = 3


A composite number has at least 1 divisor, and we already determined that both 3 and 7 are divisors, so:


21 is a composite number


21 is a composite number.

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Q: Is 21 prime composite or neither?
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