When their quotient has no remainder.
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A number is divisible by another when the remainder of the division is zero.
A number is divisible by another when the remainder after division by that number is zero.
All numbers are divisible by 1. So, apart from the number 1, all numbers are divisible by another number. These numbers are therefore prime or composite.
When it is a factor of that number
if the number is not divisible by another number