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A number is divisible by 6 if the number is divisible by 2 AND 3.
you can't
No. If it is not divisible by 2 it cannot be divisible by 8, so don'y bother.
Edward Chavez
Every number has a test for divisibility. The issue is that the tests get more complicated as the divisor increases. For primes up to 50, see either of the attached links.