No.
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315 is divisible by 3. 2 does not go in evenly.
105, 210, 315 and so on.
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.
150, but there may be other, lesser numbers as well. There is also 315.
Yes: 945 ÷ 3 = 315