What are the factors and prime factors of 2145?

Answer 1

Primes: 3, 5, 11, 13

Others are combinations of the primes, i.e.

3 x 5 = 15

3 x 11 = 33

3 x 13 = 39

5 x 11 = 55

5 x 13 = 65

11 x 13 = 143

3 x 5 x 11 = 165

2 x 5 x 13 = 195

3 x 11 x 13 = 429

5 x 11 x 13 = 715

Answer 2

1, 3, 5, 9, 15, 27, 45, 81, 135, 243, 405, 729, 1215, 3645

3 and 5 are prime.