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Anonymous Posted on Feb 23, 2015

Why are 21,25,27, etc not prime numbers? - Computers & Internet

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kakima

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  • Posted on Feb 23, 2015
kakima
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A prime number is a number that's evenly divisible only by one and itself. 21 is divisible by 3 and 7, 25 is divisible by 5, and 27 is divisible by 3.

See Prime number Wikipedia the free encyclopedia

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What is a prime number

a prime number is a number that can only be multiplied by itself and 1 - example 3 can only be multiplied by itself and 1.
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