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400 is a composite number because it is divisible by more than two numbers. Because it ends in a 0, the divisibility rules indicate it is divisible by 2, 5, and 10. (It is also divisible by other numbers.) It is not a Prime number because a prime number has exactly two factors, 1 and itself.

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โˆ™ 2010-04-06 03:50:31
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Q: Is 400 a prime number or a composite number?
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