If N is a positive integer, not including N, how many factors does N have? (1) Not including N^2, N^2 has 4 factors -> N^2 (a perfect square) has a total of 5 factors => N has 3 factors in total (N is a perfect square of prime number).example: N = 4; N^2 = 16 (5 factors); N has 2 factors excluding N.example: N = 9; N^2 = 81 (5 factors); N has 2 factors excluding N.(2) Not including 2N, 2N has 3 fa