Most of the numbers you encounter will be divisible by 2, 3, 5 or 7. Start there. Let's try 210.
210 (Since it's even, it's divisible by two.)
105,2 (105 is divisible by three)
35,3,2 (35 is divisible by 5.)
7,5,3,2 (7 is prime and can't be reduced further.)
2 x 3 x 5 x 7 = 210
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