1, 3, 5 and 15
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Oh, dude, you can make arrays with 15 like 1x15, 3x5, and 5x3. It's like, the possibilities are endless... well, not really, but you get the point. So, yeah, those are the arrays you can make with 15.
15 Factors of 15: 1, 3, 5, 15 15 = 1 x 15 15 = 3 x 5
A number is prime if it has only 1 and itself as factors. For example, 7 is a prime number because it has only 1 and 7 as factors. 15 isn't a prime number because it has 1, 3, 5, and 15 as factors.
3 and 5 are Prime Factors of 15 (3x5=15).
Factors are numbers you can multiply together to get another number. 15: 1, 3, 5, 15