Prime factorization is the finding which Prime number multiply to get to make the original number.
140: 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140
Prime: 2, 5, 7
Prime Factorization: 2 x 2 x 5 x 7
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2 x 2 x 5 x 7 = 140
Multiply prime numbers or prime factors to find their product.
21 as a product of its prime factors is 1 X 3 X 7.
As a product of its prime factors: 2*5*5*5 = 250
As a product of its prime factors: 2*2*2*5*7 = 280