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.
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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.
When it is a factor of that number
if the number is not divisible by another number
The fat that it is divisible means that the remainder must be zero.