It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 989 398 is not a prime number.
For example, 989 398 can be divided by 2: 989 398 / 2 = 494 699.
For 989 398 to be a prime number, it would have been required that 989 398 has only two divisors, i.e., itself and 1.
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989 398 is an even number, because it is evenly divisible by 2: 989 398 / 2 = 494 699.
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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 989 398 is about 994.685.
Thus, the square root of 989 398 is not an integer, and therefore 989 398 is not a square number.
The square of a number (here 989 398) is the result of the product of this number (989 398) by itself (i.e., 989 398 × 989 398); the square of 989 398 is sometimes called "raising 989 398 to the power 2", or "989 398 squared".
The square of 989 398 is 978 908 402 404 because 989 398 × 989 398 = 989 3982 = 978 908 402 404.
As a consequence, 989 398 is the square root of 978 908 402 404.
The multiples of 989 398 are all integers evenly divisible by 989 398, that is all numbers such that the remainder of the division by 989 398 is zero. There are infinitely many multiples of 989 398. The smallest multiples of 989 398 are: