4 has 3 factors (1,2,4)
9 has 3 factors (1,3,9)
25 has 3 factors (1,5,25)
100 has 9 factors (1,2,4,5,10,20,25,50,100)
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All of them. Different numbers have different numbers of factors.
8 of them.
14
36
If you can compile a complete list of all different rectangular models with sides of integer length for a number then their lengths and breadths represent its factors.