Is 645 a composite number?
Question: Is 645 a composite number?
For 645 to be a composite number, it must be divisible by more than 645 and 1.
In other words, 645 must have more than two factors to be a composite number.
Since 645 is divisible by more than 645 and 1, 645 is a composite number.
Thus, the answer to the question "Is 645 a composite number?" is YES.
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