3 is a prime factor of 72 and is contained in the prime factorization.
33 is not a factor of 72.
By multiplying some of the prime numbers together.
The longest factor string of any composite number is its prime factorization.
By multiplying 2 and 3.
That's a prime factorization.
Any factor that isn't prime.
Each composite number has its own unique prime factorization. The largest number in that factorization would be the largest prime factor. It will never be more than half of the original number.
Since 81 is a composite number, you use composite factorization. 81x2x2x2x2 is 1,296.
When you want to find the prime factorization of a composite number.
Any number that isnot a prime,not a factor of the composite numbercannot appear in the prime factorisation of a composite number.
Prime factorization never includes a composite number. All numbers in prime factorization must be prime numbers.