It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 39 997 is not a prime number.
For example, 39 997 can be divided by 23: 39 997 / 23 = 1 739.
For 39 997 to be a prime number, it would have been required that 39 997 has only two divisors, i.e., itself and 1.
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39 997 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 39 997 is about 199.992.
Thus, the square root of 39 997 is not an integer, and therefore 39 997 is not a square number.
The square of a number (here 39 997) is the result of the product of this number (39 997) by itself (i.e., 39 997 × 39 997); the square of 39 997 is sometimes called "raising 39 997 to the power 2", or "39 997 squared".
The square of 39 997 is 1 599 760 009 because 39 997 × 39 997 = 39 9972 = 1 599 760 009.
As a consequence, 39 997 is the square root of 1 599 760 009.
The multiples of 39 997 are all integers evenly divisible by 39 997, that is all numbers such that the remainder of the division by 39 997 is zero. There are infinitely many multiples of 39 997. The smallest multiples of 39 997 are: