15 is both a multiple and a factor of itself.
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Which number is a factor of 10 , but not a multiple of 5
5,631,683,557,500,000 is a multiple of 3 because its digits add up to a multiple of 3. It's a multiple of 5 because it ends in a zero. If it's a multiple of 3 and 5, it's a multiple of 15, so 15 is a factor of it.
The Greatest Common Factor of 15, 45: 15The Least Common Multiple of 15, 45: 45
1 and 5
15