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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.

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11y ago

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15y ago

1155 is not prime. 1155 = 3 * 5 * 7 * 11

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Q: Is 1155 a prime number or a composite number?
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