Expressing a number as a "product of its prime factors" is also known as the prime factorization.
To find the prime factorization, keep dividing a number by prime numbers until all the factors are prime. You can also use a factor tree or rainbow or fireworks or whichever method works best for you.
Example: 330
330
165,2
55,3,2
11,5,3,2
2 x 3 x 5 x 11 = 330, expressed as a product of its prime factors.
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Multiply prime numbers or prime factors to find their product.
To write a composite whole number as the product of its prime factors is to write its prime factorization.
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.
As a product of its prime factors: 2*5*5*5 = 250