Squares of prime numbers are the only numbers with three factors, since there must be only one nontrivial divisor for a number to have three factors. That number must thus be prime.
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The factors of 1 are:1The factors of 3 are:1, 3The factors of 9 are:1, 3, 9The common factor is:1
The factors of 15 are: 1, 3, 5, and 15.The prime factors of 15 are: 3 and 5.The factors of 21 are: 1, 3, 7, and 21.The prime factors of 21 are: 3 and 7.
The common factors are: 1, 3
there are only 2 factors because 3 is a prime number: the factors are 1 and 3
Factors of 6 1,2,3,6 Factors of 3 1,3 (this mean that 3 is a prime number)