Two.
Only one - which is repeated.
The prime factorization of 60 is: 2 x 2 x 3 x 5.
3 and 7 are the two different prime factors of 63. Prime factorization of 63 is 3 x 3 x 7.
Just one, used twice: 17 x 17 = 289
2 and 5 are the two different prime factors of 400. The prime factorization of 400 is 2 x 2 x 2 x 2 x 5 x 5.
3. (2 x 5 x 5.)
The prime factorization of 56 is 2, 2, 2, and 7, so there there are two prime numbers, 2 and 7, that can evenly go into 56.
Since there are infinitely many prime numbers there are infinitely many sets of three prime numbers and so there are infinitely many products.
There are two different numbers. 3 and 7
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The prime factors of 297 are 3 and 11. The prime factorization of 297 is 3 x 3 x 3 x 11