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Just by looking at it, without applying any exotic tools or analytical procedures, we can see that it's divisible by 5 (because it ends in 5), and it's also divisible by 3 (because the sum of its digits is divisible by 3). So we already know that it can't be prime, regardless of how many other factors it may have.

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βˆ™ 15y ago
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Q: Is 1005 a composite number or a prime number?
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