It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 397 398 is not a prime number.
For example, 397 398 can be divided by 2: 397 398 / 2 = 198 699.
For 397 398 to be a prime number, it would have been required that 397 398 has only two divisors, i.e., itself and 1.
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397 398 is an even number, because it is evenly divisible by 2: 397 398 / 2 = 198 699.
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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 397 398 is about 630.395.
Thus, the square root of 397 398 is not an integer, and therefore 397 398 is not a square number.
The square of a number (here 397 398) is the result of the product of this number (397 398) by itself (i.e., 397 398 × 397 398); the square of 397 398 is sometimes called "raising 397 398 to the power 2", or "397 398 squared".
The square of 397 398 is 157 925 170 404 because 397 398 × 397 398 = 397 3982 = 157 925 170 404.
As a consequence, 397 398 is the square root of 157 925 170 404.
The multiples of 397 398 are all integers evenly divisible by 397 398, that is all numbers such that the remainder of the division by 397 398 is zero. There are infinitely many multiples of 397 398. The smallest multiples of 397 398 are: