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Write the prime factorization with exponents. Add 1 to each exponent. (Numbers without exponents actually have the exponent 1.) Multiply them together. That will be the number of factors.

10 = 2 x 5 = 21 x 51

2 x 2 = 4

10 has four factors.

72 = 23 x 32

4 x 3 = 12

72 has twelve factors.

Square numbers can be tricky. The prime factorization of 9 should be written as 32, not 3 x 3. Adding 1 to the 2 gives you 3. 9 has three factors.

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10y ago

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