No.
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Numbers that have no common factor like 8 and 9 as 8=23 and 9=32 The two of them are not prime but they have no common factor
The prime numbers (factors) of 75 are: 3 and 5
5,1
Prime numbers are: 2 3 5 7 Composite numbers are: 4 6 8 9 10 So the ratio is: 4 to 5
9 times 9=2*8+51 the factor is 3