It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 397 999 is not a prime number.
For example, 397 999 can be divided by 7: 397 999 / 7 = 56 857.
For 397 999 to be a prime number, it would have been required that 397 999 has only two divisors, i.e., itself and 1.
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397 999 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 397 999 is about 630.872.
Thus, the square root of 397 999 is not an integer, and therefore 397 999 is not a square number.
The square of a number (here 397 999) is the result of the product of this number (397 999) by itself (i.e., 397 999 × 397 999); the square of 397 999 is sometimes called "raising 397 999 to the power 2", or "397 999 squared".
The square of 397 999 is 158 403 204 001 because 397 999 × 397 999 = 397 9992 = 158 403 204 001.
As a consequence, 397 999 is the square root of 158 403 204 001.
The multiples of 397 999 are all integers evenly divisible by 397 999, that is all numbers such that the remainder of the division by 397 999 is zero. There are infinitely many multiples of 397 999. The smallest multiples of 397 999 are: