It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 364 is not a prime number.
For example, 998 364 can be divided by 2: 998 364 / 2 = 499 182.
For 998 364 to be a prime number, it would have been required that 998 364 has only two divisors, i.e., itself and 1.
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998 364 is an even number, because it is evenly divisible by 2: 998 364 / 2 = 499 182.
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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 998 364 is about 999.182.
Thus, the square root of 998 364 is not an integer, and therefore 998 364 is not a square number.
The square of a number (here 998 364) is the result of the product of this number (998 364) by itself (i.e., 998 364 × 998 364); the square of 998 364 is sometimes called "raising 998 364 to the power 2", or "998 364 squared".
The square of 998 364 is 996 730 676 496 because 998 364 × 998 364 = 998 3642 = 996 730 676 496.
As a consequence, 998 364 is the square root of 996 730 676 496.
The multiples of 998 364 are all integers evenly divisible by 998 364, that is all numbers such that the remainder of the division by 998 364 is zero. There are infinitely many multiples of 998 364. The smallest multiples of 998 364 are: