No. Nor, for that matter is +3.1 An integer cannot have any number after the decimal point (except an infinite number of 9s).
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1 and 31
Try if you can find an integer which, when squared, gives you 31. If you can find it, 31 is a perfect square; otherwise, it isn't. Alternately, use your calculator to calculate the square root of 31. If you get an integer, it is a perfect square; otherwise, it isn't.
31 is prime. 32 and 33 are composite.
15 and 16.
31 is a prime number. It has no positive integer factors apart from itself and 1.