It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 397 994 is not a prime number.
For example, 397 994 can be divided by 2: 397 994 / 2 = 198 997.
For 397 994 to be a prime number, it would have been required that 397 994 has only two divisors, i.e., itself and 1.
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397 994 is an even number, because it is evenly divisible by 2: 397 994 / 2 = 198 997.
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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 397 994 is about 630.868.
Thus, the square root of 397 994 is not an integer, and therefore 397 994 is not a square number.
The square of a number (here 397 994) is the result of the product of this number (397 994) by itself (i.e., 397 994 × 397 994); the square of 397 994 is sometimes called "raising 397 994 to the power 2", or "397 994 squared".
The square of 397 994 is 158 399 224 036 because 397 994 × 397 994 = 397 9942 = 158 399 224 036.
As a consequence, 397 994 is the square root of 158 399 224 036.
The multiples of 397 994 are all integers evenly divisible by 397 994, that is all numbers such that the remainder of the division by 397 994 is zero. There are infinitely many multiples of 397 994. The smallest multiples of 397 994 are: