No, and the first give-away is that it ends in 5 (divisible by 5).
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345
Composite
The LCM (Least Common Multiple) of 115 and 15 is 345. The prime factors of 115 are 5 and 23. The prime factors of 15 are 3 and 5. Multiply the smallest encountered number of same factors, 3, 5, and 23, to get 345.
Itself because 345/345 = 1
345 3 x 115 3 x 5 x 23 345 = 3 x 5 x 23