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A Prime number has no factors other than 1 and itself. Each multiple of fifteen includes 3, 5, and 15 among its factors.

Q: Why cant a multiple of 15 be a prime number?

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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.

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

2 is a prime number and 15 is a composite number.

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It is 19

15 is one possible answer.

No... Every whole number that ends with a 5 includes 5 as a factor (is a multiple of 5).

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.

Because fifteen is a compound number. That is it is a multiple of 5 & 3 .

3*5 = 15 in prime numbers

There is no LCM of a single number. LCM is the multiple of the highest power of prime factors in two or more numbers. Example: LCM of 9, 15, and 25 is 225, which is the multiple of the highest power of prime factors in 9, 15, and 25 (32 x 52).

15 is a factor of 45, but it is not a prime 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

2 is a prime number and 15 is a composite number.

3 and 5 are Prime Factors of 15 (3x5=15).

Number 17 is but 15 isn't as 5x3 isn't a prime number