One way to tell that 675 is a multiple of 5 is to divide 675 by 5 and see if it comes out without a fraction. 675 divided by 5 = 135. Another way is to know that any integer ending in five is a multiple of 5.
84.375
Any multiple of 2700
42
0.04
21.0938
675
10.0089
225
675 divided by 9 is 75.
Prime Factors of 675 are: 1, 3 and 5 675 = 5 * 5 * 5 * 5 = 54 675 = 3 * 3 * 3 * 5 * 5 = 33 * 52
675 = 5 * 5 * 5 * 5 = 54