It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 489 398 is not a prime number.
For example, 489 398 can be divided by 2: 489 398 / 2 = 244 699.
For 489 398 to be a prime number, it would have been required that 489 398 has only two divisors, i.e., itself and 1.
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489 398 is an even number, because it is evenly divisible by 2: 489 398 / 2 = 244 699.
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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 489 398 is about 699.570.
Thus, the square root of 489 398 is not an integer, and therefore 489 398 is not a square number.
The square of a number (here 489 398) is the result of the product of this number (489 398) by itself (i.e., 489 398 × 489 398); the square of 489 398 is sometimes called "raising 489 398 to the power 2", or "489 398 squared".
The square of 489 398 is 239 510 402 404 because 489 398 × 489 398 = 489 3982 = 239 510 402 404.
As a consequence, 489 398 is the square root of 239 510 402 404.
The multiples of 489 398 are all integers evenly divisible by 489 398, that is all numbers such that the remainder of the division by 489 398 is zero. There are infinitely many multiples of 489 398. The smallest multiples of 489 398 are: