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Numbers with three factors are squares of primes: 4, 9, 25

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Q: What number below 40 has exactly three factors?
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What number below 160 has exactly 3 prime factors?

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The smallest number that has exactly three factors is 4.


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9409.


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Prime squares have three factors. 4, 9, 25


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8, 2*2*2


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169


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How about 105 whose prime factors are 3, 5 and 7