Seudónimo Seudónimo

29-01-2016
Mathematics

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Is 21 a prime number?

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sissy863 sissy863

29-01-2016

No.
7×3=21
7×1=21
A prime number can only be multiplied by 1 and itself.

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Cortes33 Cortes33

29-01-2016

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

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