It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 198 398 is not a prime number.
For example, 198 398 can be divided by 2: 198 398 / 2 = 99 199.
For 198 398 to be a prime number, it would have been required that 198 398 has only two divisors, i.e., itself and 1.
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198 398 is an even number, because it is evenly divisible by 2: 198 398 / 2 = 99 199.
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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 198 398 is about 445.419.
Thus, the square root of 198 398 is not an integer, and therefore 198 398 is not a square number.
The square of a number (here 198 398) is the result of the product of this number (198 398) by itself (i.e., 198 398 × 198 398); the square of 198 398 is sometimes called "raising 198 398 to the power 2", or "198 398 squared".
The square of 198 398 is 39 361 766 404 because 198 398 × 198 398 = 198 3982 = 39 361 766 404.
As a consequence, 198 398 is the square root of 39 361 766 404.
The multiples of 198 398 are all integers evenly divisible by 198 398, that is all numbers such that the remainder of the division by 198 398 is zero. There are infinitely many multiples of 198 398. The smallest multiples of 198 398 are: