It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 15 997 is not a prime number.
For example, 15 997 can be divided by 17: 15 997 / 17 = 941.
For 15 997 to be a prime number, it would have been required that 15 997 has only two divisors, i.e., itself and 1.
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15 997 is an odd number, because it is not evenly divisible by 2.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 15 997 is about 126.479.
Thus, the square root of 15 997 is not an integer, and therefore 15 997 is not a square number.
The square of a number (here 15 997) is the result of the product of this number (15 997) by itself (i.e., 15 997 × 15 997); the square of 15 997 is sometimes called "raising 15 997 to the power 2", or "15 997 squared".
The square of 15 997 is 255 904 009 because 15 997 × 15 997 = 15 9972 = 255 904 009.
As a consequence, 15 997 is the square root of 255 904 009.
The multiples of 15 997 are all integers evenly divisible by 15 997, that is all numbers such that the remainder of the division by 15 997 is zero. There are infinitely many multiples of 15 997. The smallest multiples of 15 997 are: