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27 July, 17:58

Which number has exactly 3 factors

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  1. 27 July, 20:06
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    There are a few answers to that. The squares of prime numbers have exactly three factors.

    Ex: 4 has 1, 2, and 4.

    9 has 1, 3, and 9.

    25 has 1, 5, and 25.

    49 has 1, 7, and 49.

    121 has 1, 11, and 121.

    169 has 1, 13, and 169.
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