For an integer x to be evenly divisible by another integer y, x/y must also be an integer. Here are some examples:
4/2=2.
15/3=5.
18/6=3.
From these examples, you can see that 4 is divisible by 2, 15 is divisible by 3, and 18 is divisible by 6.
When two numbers are not evenly divisible by each other, you end up with a remainder, or fractional/decimal answer. Here is an example:
25/2 =12.5
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