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Any number ending in 5 (or 0) is divisible by 5 and is therefore composite. The only exception is 5 itself which is prime.

Q: Is 1155 prime or composite

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1155 is composite.

composite

It is composite

It is composite.

1155 is a composite number because it has more than two factors.

It is composite.

1155 is a composite number because it has more than two factors

1155 is obviously a multiple of 5 and a multiple of 11, so it is a composite number.

A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 1155 is composite.

1155 ends with 5, which means it is divisible by 5. It is a composite number because it has factors in addition to 1 and itself.

1155 is a composite number because it ends with 5. All numbers that end with 5 except 5 itself are composite numbers because they are divisible by 5, which means there are at least three factors, 1, 5, and the number itself.

1155 = 3 * 5 * 7 * 11 So, no, since it has factors other than one and itself, it's composite.