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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, & 21


No. 21=3*7
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Wiki User

12y ago

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More answers

Is 21 a prime or composite

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Anonymous

4y ago
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No

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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 number
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