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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.

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Wiki User

11y ago

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More answers

Factors of 21 are 1, 3, 7, and 21. 21 is a compositenumber because it has more factors than just 1 and itself.

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Wiki User

13y ago
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It is composite because it has more than two factors

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Wiki User

12y ago
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It is composite because it has more than 2 factors

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Wiki User

12y ago
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Composite, 21=3*7

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Wiki User

12y ago
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Composite

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Wiki User

13y ago
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Composite.

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Wiki User

8y ago
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Prime

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Anonymous

4y ago
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prime

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Anonymous

4y ago
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No

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Anonymous

4y ago
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Q: Is 21 a prime or composite number?
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