It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 399 398 is not a prime number.
For example, 399 398 can be divided by 2: 399 398 / 2 = 199 699.
For 399 398 to be a prime number, it would have been required that 399 398 has only two divisors, i.e., itself and 1.
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399 398 is an even number, because it is evenly divisible by 2: 399 398 / 2 = 199 699.
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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 399 398 is about 631.979.
Thus, the square root of 399 398 is not an integer, and therefore 399 398 is not a square number.
The square of a number (here 399 398) is the result of the product of this number (399 398) by itself (i.e., 399 398 × 399 398); the square of 399 398 is sometimes called "raising 399 398 to the power 2", or "399 398 squared".
The square of 399 398 is 159 518 762 404 because 399 398 × 399 398 = 399 3982 = 159 518 762 404.
As a consequence, 399 398 is the square root of 159 518 762 404.
The multiples of 399 398 are all integers evenly divisible by 399 398, that is all numbers such that the remainder of the division by 399 398 is zero. There are infinitely many multiples of 399 398. The smallest multiples of 399 398 are: