As a product of its prime factors 2*3*3 = 18.
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In this case because you are using prime factorization you need to express it using multiplication. 5*5*3*3 = 225 all the products are prime numbers.
As a product of its prime factors: 3*5 = 15
No 5291 is not a prime using 2 numbers. It is a prime using three numbers.
Using multiplication 40 times 45 = 1800
Divide the first two of the same three numbers by eachother, and then add the third same number to the answer you get.