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If a number is prime, that means no number will divide into it except itself and one. Let's try dividing 18 by some different numbers and seeing what we come up with.
18 / 7 = 2.57 18 / 4 = 4.5 18 / 17 = 1.06 18 / 2 = 9 ; this means 2 divides into 18. And there you have it! 18 is not prime.
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