None. 7 is a prime number.
Its prime factor is 2 and as a product of its prime factor 2 to the power of 7 = 128
2x2x3x3x7 = 252 just multiply 2,2,3,3 and 7 together and this is a product of prime numbers which equals 252 the product just means to multiply
5 x 7 = 35
As a product of its prime factors: 3*3*5*5*7 = 1575
As a product of its prime factors: 7*17 = 119
The prime factors are: 2, 3 and 7. (2*3*7 = 42)
As a product of its prime factors: 7*7*13 = 637
It is 7 because the product of its prime factors are: 3*3*7 = 63
3*3*7
7 x 13 = 91
21 = 3 x 7