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Factors of 81 in pairs: 1 x 81, 3 x 27, 9 x 9
2575/5 = 515/5 = 103/103 = 1 5 x 5 x 103 = 2575
Factors of 81 in pairs = 1 x 81, 3 x 27, 9 x 9, 27 x 3, 81 x 1.
9 is not a prime number. 3 x 3 x 3 = 27
3³ = 3 x 3 x 3 = 27 1 x 3 x 9 = 27 1 x 1 x 27 = 27