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100
As a product of its prime factors: 2*2*5*5 = 100
4 and 25
-16
76
120
-6
The numbers are 2 and -4
129
50
The only multiplies that go into 2 is 1x2 because 2 is a prime number.
105
They are: 3+2 = 5 and 3^2 = 9