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Actually, 1 is composite. As for 0: "Zero has an infinite number of divisors (any nonzero whole number divides zero). It cannot be written as a product of two factors, neither of which is itself, so zero is also not composite. It falls in a class of numbers called zero-divisors. These are numbers such that, when multiplied by some

nonzero number, the product is zero. " -Dr. Rob, the math forum

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Q: Why 1 and 0 are not prime number nor composite number?
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