It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 108 is not a prime number.
For example, 998 108 can be divided by 2: 998 108 / 2 = 499 054.
For 998 108 to be a prime number, it would have been required that 998 108 has only two divisors, i.e., itself and 1.
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998 108 is an even number, because it is evenly divisible by 2: 998 108 / 2 = 499 054.
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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 998 108 is about 999.054.
Thus, the square root of 998 108 is not an integer, and therefore 998 108 is not a square number.
The square of a number (here 998 108) is the result of the product of this number (998 108) by itself (i.e., 998 108 × 998 108); the square of 998 108 is sometimes called "raising 998 108 to the power 2", or "998 108 squared".
The square of 998 108 is 996 219 579 664 because 998 108 × 998 108 = 998 1082 = 996 219 579 664.
As a consequence, 998 108 is the square root of 996 219 579 664.
The multiples of 998 108 are all integers evenly divisible by 998 108, that is all numbers such that the remainder of the division by 998 108 is zero. There are infinitely many multiples of 998 108. The smallest multiples of 998 108 are: