All the numbers above 2 that are the squares of odd primes have exactly 3 factors: 1, the odd prime, and the odd prime squared. 4, 9, 25, 49, 81, 121,...
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They are all factors of 60
Numbers having 3 factors are 4 and the squares of all odd prime numbers (9, 25, 49, 121, etc.).
All nonzero numbers have factors. Some factors are odd numbers. 3 is an odd factor of 12.
Calculate the least common multiple of the three numbers. Any multiple of that has all those numbers as factors.
All numbers have factors. Some numbers have some of the same factors as other numbers. These are common factors. If the factor is a prime number, it is a common prime factor. 3 is a prime number. 3 is a factor of 9. 3 is a factor of 12. 3 is a common prime factor of 9 and 12.