It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 390 398 is not a prime number.
For example, 390 398 can be divided by 2: 390 398 / 2 = 195 199.
For 390 398 to be a prime number, it would have been required that 390 398 has only two divisors, i.e., itself and 1.
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390 398 is an even number, because it is evenly divisible by 2: 390 398 / 2 = 195 199.
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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 390 398 is about 624.818.
Thus, the square root of 390 398 is not an integer, and therefore 390 398 is not a square number.
The square of a number (here 390 398) is the result of the product of this number (390 398) by itself (i.e., 390 398 × 390 398); the square of 390 398 is sometimes called "raising 390 398 to the power 2", or "390 398 squared".
The square of 390 398 is 152 410 598 404 because 390 398 × 390 398 = 390 3982 = 152 410 598 404.
As a consequence, 390 398 is the square root of 152 410 598 404.
The multiples of 390 398 are all integers evenly divisible by 390 398, that is all numbers such that the remainder of the division by 390 398 is zero. There are infinitely many multiples of 390 398. The smallest multiples of 390 398 are: