3 x 3 x 5 x 5
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32*52 = 225
225 cannot be factorised into the product of only 3 prime numbers.
As a product of its prime factors: 3*7*7 = 147
As a product of its prime factors: 3*7 = 21
Numbers that have 2 factors are prime numbers; Numbers that have 4 factors are either: * the cube of a prime; or * the product of two different primes; Numbers that have 8 factors are either: * a prime to the power 7; * the product of a prime cubed and different prime; * the product of three different primes.