1, 3, 5, 9, 15, 45
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15 is a factor of 45, but it is not a prime number.
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The number between 41 and 49 that has 5 is a factor is 45.
45 Is not a prime number because it has more than 2 factors. A prime number only has itself and 1 as a factor. The factors of 45 are: 1, 3, 5, 9, 15 and 45.
The highest common factor is 1. Since 13 is a prime number - its only factors are 1 and itself. 13 is not a factor of 45.