It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 9 998 244 is not a prime number.
For example, 9 998 244 can be divided by 2: 9 998 244 / 2 = 4 999 122.
For 9 998 244 to be a prime number, it would have been required that 9 998 244 has only two divisors, i.e., itself and 1.
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9 998 244 is an even number, because it is evenly divisible by 2: 9 998 244 / 2 = 4 999 122.
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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 9 998 244 is 3 162.
Therefore, the square root of 9 998 244 is an integer, and as a consequence 9 998 244 is a perfect square.
The square of a number (here 9 998 244) is the result of the product of this number (9 998 244) by itself (i.e., 9 998 244 × 9 998 244); the square of 9 998 244 is sometimes called "raising 9 998 244 to the power 2", or "9 998 244 squared".
The square of 9 998 244 is 99 964 883 083 536 because 9 998 244 × 9 998 244 = 9 998 2442 = 99 964 883 083 536.
As a consequence, 9 998 244 is the square root of 99 964 883 083 536.
The multiples of 9 998 244 are all integers evenly divisible by 9 998 244, that is all numbers such that the remainder of the division by 9 998 244 is zero. There are infinitely many multiples of 9 998 244. The smallest multiples of 9 998 244 are: