What are factors and string and length?

Factors are integers that can be multiplied together to create a product. Such multiplication sentences are called strings. The length of the string is how many numbers are in it.

6 x 4 is a factor string for 24.

2 x 3 x 4 is a longer factor string for 24.

2 x 2 x 2 x 3 is the longest factor string for 24. The longest factor string is also known as the prime factorization.