It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 397 996 is not a prime number.
For example, 397 996 can be divided by 2: 397 996 / 2 = 198 998.
For 397 996 to be a prime number, it would have been required that 397 996 has only two divisors, i.e., itself and 1.
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397 996 is an even number, because it is evenly divisible by 2: 397 996 / 2 = 198 998.
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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 397 996 is about 630.869.
Thus, the square root of 397 996 is not an integer, and therefore 397 996 is not a square number.
The square of a number (here 397 996) is the result of the product of this number (397 996) by itself (i.e., 397 996 × 397 996); the square of 397 996 is sometimes called "raising 397 996 to the power 2", or "397 996 squared".
The square of 397 996 is 158 400 816 016 because 397 996 × 397 996 = 397 9962 = 158 400 816 016.
As a consequence, 397 996 is the square root of 158 400 816 016.
The multiples of 397 996 are all integers evenly divisible by 397 996, that is all numbers such that the remainder of the division by 397 996 is zero. There are infinitely many multiples of 397 996. The smallest multiples of 397 996 are: