No, 6, 12, 18, 24...are even numbers that are multiples of 3.
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Yes 3 is an odd number and 27 is a multiple of 3 because 3*9 = 27
15 and any odd multiple of 15.
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Every prime number except 2 must be odd. This is because if it were even it would be divisible by 2 and so wouldn't be a prime number. The next point to note is that all odd numbers are one more or one less than a multiple of 4. Because 2 more than a multiple of 4 is even, and 3 more than a multiple of 4 is the same as 1 less than the multiple of 4 above. Thus every prime number except 2 must be 1 more or 1 less than a multiple of 4.