2 x 2 x 2 x 7 x 7 = 392
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72 *23
The prime factors of 392 are 2, 2, 2, 7, and 7. To find the prime factors, you divide 392 by the smallest prime number (2) until you cannot divide evenly. The factors of 392 are 1, 2, 4, 7, 8, 14, 28, 49, 56, 98, 196, and 392. These are all the numbers that can divide evenly into 392.
Multiply prime numbers or prime factors to find their product.
As a product of its prime factors: 5*5*5*11 = 1375
21 as a product of its prime factors is 1 X 3 X 7.