186 Divide by two.
93,2 Divide by three.
31,3,2 Stop. All the factors are prime.
2 x 3 x 31 = 186
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13 is already prime. It doesn't need a tree.
56 28,2 14,2,2 7,2,2,2
484 242,2 121,2,2 11,11,2,2
126 ^ 9 14 ^ ^ 3 3 7 2
675 225,3 75,3,3 25,3,3,3 5,5,3,3,3