Try it out! Do the division! If you get an integer (there are no decimals), it means it is a multiple.
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104 117 130 143 156 169 182 195
They are: 9*13 = 117 and 117/9 = 13
117 is a composite. I know because suming the digits is 9. A number is a multiple of 117 if it's a multiple of 9 and 13 at the same time
117 = 3 x 3 x 13. It is: 3^2*13 = 117
45/117 = 5/1345/117 = 5/1345/117 = 5/1345/117 = 5/13