52 = 25
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5
1, 5, 25 Circle the 5
The factors of 75 are 1, 3, 5, 15, 25 and 75. The prime factors are 3 and 5.
The factors of 325 are 1, 5, 13, 25, 65, and 325. 5 and 13 are prime.
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.