A number is divisible by 13 if it is a multiple of 13.
In other words, 13 times a number results in a big number that is divisible by 13.
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13 and all its multiples are divisible by 13.
The number 70 is divisible by 13, but not evenly.
Every number divisible by 10 is divisible by 5.
No 13 is not divisible by 3 because there would be a remainder of 1 and a number that is divisible by another should have no remainder
221 is divisible by 1, 13, 17, and 221.