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Any square of a Prime number. For example, 5*5 = 25 has the factors 1, 5, 25. If you square any other prime number, call it "p", the factors of the result are 1, p, p square.

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15y ago

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4, 9 and 25. Prime number squares have three factors.

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13y ago
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Multiples of 3, like 3, 6 and 9

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12y ago
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The number 4 has only three factors.

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15y ago
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Prime squares

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12y ago
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A prime square.

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12y ago
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prime squares

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9y ago
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Q: What is a number with only 3 factors called?
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