Calculator says search a prime factor calculator, its, from my head, 3*7*11
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They are: 5*5*5*11 = 1375
225 cannot be factorised into the product of only 3 prime numbers.
105 = 3 x 5 x 7
3 x 3 x 7 x 7 = 441
3 x 7 x 11 = 231