Any of its multiples
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The number 18 can be evenly divided by the numbers 1, 2, 3, 6, 9, and 18 itself.
All of these numbers are composite except for 2, which is prime.Prime numbers are numbers that can only be divided evenly by 1 and itself.Composite numbers can be divided evenly by 1, itself, and at least one more number.
It can not be divided by anything and come out as an evenly. only numbers for example like 0 6 15 21 and 18 if they were divided by three would be able to ccome out evenly.
Composite numbers.
1, 2, 3, 6, 9, 18, 27, 54, 81, 162.