A Prime number has no factors other than 1 and itself. Each multiple of fifteen includes 3, 5, and 15 among its factors.
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It is 19
No... Every whole number that ends with a 5 includes 5 as a factor (is a multiple of 5).
15 is a factor of 45, but it is not a prime number.
2 is a prime number and 15 is a composite number.
Prime factor each number. Use each prime factor the most it was used in any one number. 15=3x5 25=5x5 30=2x3x5 2x3x5x5=150