It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 398 298 is not a prime number.
For example, 398 298 can be divided by 2: 398 298 / 2 = 199 149.
For 398 298 to be a prime number, it would have been required that 398 298 has only two divisors, i.e., itself and 1.
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398 298 is an even number, because it is evenly divisible by 2: 398 298 / 2 = 199 149.
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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 398 298 is about 631.109.
Thus, the square root of 398 298 is not an integer, and therefore 398 298 is not a square number.
The square of a number (here 398 298) is the result of the product of this number (398 298) by itself (i.e., 398 298 × 398 298); the square of 398 298 is sometimes called "raising 398 298 to the power 2", or "398 298 squared".
The square of 398 298 is 158 641 296 804 because 398 298 × 398 298 = 398 2982 = 158 641 296 804.
As a consequence, 398 298 is the square root of 158 641 296 804.
The multiples of 398 298 are all integers evenly divisible by 398 298, that is all numbers such that the remainder of the division by 398 298 is zero. There are infinitely many multiples of 398 298. The smallest multiples of 398 298 are: