Is 18 a composite or prime number?

Let's examine it and find out:
The rule is: If a number has any other factors besides '1' and itself, then it's composite.
The factors of 18 are: 1, 2, 3, 6, 9, and 18 .
18 appears to be a composite number.

Answered by AL2006 | 2024-06-10

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.

Answered by Anonymous | 2024-06-10

18 is a composite number because it has factors other than just 1 and itself. The factors of 18 are 1, 2, 3, 6, 9, and 18. Since it can be divided evenly by numbers other than 1 and 18, it is not a prime number.
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Answered by AL2006 | 2025-02-10