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Is 21 a prime number?

Is 21 a prime number?
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Is 21 a prime number?

User Mate Zabo
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21 is not a prime number, its a composite number because its divisible by 3 and 7
and prime numbers only have 1 and its self as factors..
Hope it helps :D

User Jimmy Sawczuk
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8.1k points
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No.
7×3=21
7×1=21
A prime number can only be multiplied by 1 and itself.
User Nate Dudek
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