The answer is 14,348,907. There was an answer "375" here before, which I can only assume is a mistake for fifteen to the third power--that is 3375. Three to the fifteenth power means 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3.
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None of them are multiples of 15. The be a multiple of 15, a number must have both the prime factors 3 and 5. None of them have a prime factor of 5, thus none can be a multiple of 15.
25y**8/15y**5 25y**3/15 5y**3/3 (5/3)y**3
4 to the 2nd power times 3 to the fifth power
Base3 power5 answer243
676