90 = 2 x 32 x 5
= 2 x 3 x 3 x 5
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The prime factors are: 2,3,5.
19 and 90 have no common prime factors.
The prime factors of 90 are: 2,3,5
As a product of its prime factors: 2*3*3*5 = 90
there are none, 19 is prime and it doesnt go into 90