It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 398 498 is not a prime number.
For example, 398 498 can be divided by 2: 398 498 / 2 = 199 249.
For 398 498 to be a prime number, it would have been required that 398 498 has only two divisors, i.e., itself and 1.
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398 498 is an even number, because it is evenly divisible by 2: 398 498 / 2 = 199 249.
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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 398 498 is about 631.267.
Thus, the square root of 398 498 is not an integer, and therefore 398 498 is not a square number.
The square of a number (here 398 498) is the result of the product of this number (398 498) by itself (i.e., 398 498 × 398 498); the square of 398 498 is sometimes called "raising 398 498 to the power 2", or "398 498 squared".
The square of 398 498 is 158 800 656 004 because 398 498 × 398 498 = 398 4982 = 158 800 656 004.
As a consequence, 398 498 is the square root of 158 800 656 004.
The multiples of 398 498 are all integers evenly divisible by 398 498, that is all numbers such that the remainder of the division by 398 498 is zero. There are infinitely many multiples of 398 498. The smallest multiples of 398 498 are: