It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 244 is not a prime number.
For example, 998 244 can be divided by 2: 998 244 / 2 = 499 122.
For 998 244 to be a prime number, it would have been required that 998 244 has only two divisors, i.e., itself and 1.
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998 244 is an even number, because it is evenly divisible by 2: 998 244 / 2 = 499 122.
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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 998 244 is about 999.122.
Thus, the square root of 998 244 is not an integer, and therefore 998 244 is not a square number.
The square of a number (here 998 244) is the result of the product of this number (998 244) by itself (i.e., 998 244 × 998 244); the square of 998 244 is sometimes called "raising 998 244 to the power 2", or "998 244 squared".
The square of 998 244 is 996 491 083 536 because 998 244 × 998 244 = 998 2442 = 996 491 083 536.
As a consequence, 998 244 is the square root of 996 491 083 536.
The multiples of 998 244 are all integers evenly divisible by 998 244, that is all numbers such that the remainder of the division by 998 244 is zero. There are infinitely many multiples of 998 244. The smallest multiples of 998 244 are: