They can't. 135 can be divided by 3, 5 and 9.
135
135 divided by 9 equals 15.
445.3333
15
0.1111
9.6429
0.0222
135
9 and 5
The factor pairs of 135 are: 1 × 135 3 × 45 5 × 27 9 × 15
Yes, by these numbers: 1, 3, 5, 9, 15, 27, 45, 135,