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-- It ends in a 5, so 5 is a factor of it.

-- The sum of its digits (15) is divisible by 3, so 3 is a factor of it.

It probably has tons of other factors, but either of these is enough

to prove that it's composite.

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13y ago

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composite

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8y ago
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Q: Is 12345 prime composite or niether?
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