90
45,2
15,3,2
5,3,3,2
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No, 90 is a multiple of 18. 18 is a factor of 90.
No it is not a common factor of 48 and 90.No because 4 is a factor of 48 but not of 90
83 is prime. No tree.
61 is already prime. It doesn't need a tree.
The greatest common factor of 54 , 90 = 18