It means to write the number out as a list of primes multiplied together to get that number. For instance:
1000 = 2 * 2 * 2 * 5 * 5 * 5
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To express a composite number as the product of its prime factors.
It means to express a number as the product of its factors. Factors are either composite numbers or prime numbers (except that 0 and 1 are neither prime nor composite).
2x2x11
As a product of its prime factors: 2*3*5*7 = 210
Itself because 7 is a prime number