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29 November, 03:06

How is 89 a prime number

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  1. 29 November, 04:22
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    Hello,

    10*10=100>89

    n=89 is prime if it not divisible by all prime less then its square root

    0<890<√89<10

    The primes to test are 2,3,5,7.

    89 does not end with a even digit = = > 89 is not divisible by 2

    8+9=17 if not divisible by 3 = = >89 is not divisible by 3

    89 does not end with 0 or 5 = = >89 is not divisible by 5

    3*8+1*9=33 is not divisible by 7 = = >89 is not divisible by 7

    So: 89 is prime.
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