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Any number that is the product of two primes (excluding itself and 1) has 4 factors. For example 21 has 4 factors: 1, 3, 7, 21; of which 3 and 7 are both prime.

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Q: What is a number with only four factors?
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What is a number that has four identical even factors greater than 1 and that has only 1 and itself as factors?

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