The longest factor string of any composite number is its prime factorization.
The longest factor string you can make for 231 is 3x7x11.
The longest factor string is 2x2x2x3x13. It is always best to list your factor string from the least to greatest number.
All of the factors are prime.
The longest factor string of 44 is contained within the longest factor string of 132.
When all of the numbers are prime.
The prime factorization is the longest factor sting.
The longest factor string of 30 is 2 x 3 x 5.
The longest factor string of 100 is: 2*2*5*5=100
You will know because all of the numbers are prime.
The longest factor string for 9 is 3 x 3.
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2x2x2x3