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The squares of prime numbers have exactly three factors.

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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16y ago

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