since its not a Prime number, there are a few.
a way to figure one out is if you add up all the digits and the sum is divisible by 3, then the entire original number is divisible by 3.
In this case:
3+1+5=9
9 is divisible bye 3 evenly, so 315 is divisible by 3. Now you have to figure out WHAT times 3 equals 315. the answer to this is 105.
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315/21 = 15, hence 15 times 21 is 315
It is: 2 times 315 equals 630
5p2 = 315 Therefore, p2 = 315/5 p = sqrt(63) p = ±7.94
Times to number by each other!
for multipcation!