It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 398 798 is not a prime number.
For example, 398 798 can be divided by 2: 398 798 / 2 = 199 399.
For 398 798 to be a prime number, it would have been required that 398 798 has only two divisors, i.e., itself and 1.
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398 798 is an even number, because it is evenly divisible by 2: 398 798 / 2 = 199 399.
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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 398 798 is about 631.505.
Thus, the square root of 398 798 is not an integer, and therefore 398 798 is not a square number.
The square of a number (here 398 798) is the result of the product of this number (398 798) by itself (i.e., 398 798 × 398 798); the square of 398 798 is sometimes called "raising 398 798 to the power 2", or "398 798 squared".
The square of 398 798 is 159 039 844 804 because 398 798 × 398 798 = 398 7982 = 159 039 844 804.
As a consequence, 398 798 is the square root of 159 039 844 804.
The multiples of 398 798 are all integers evenly divisible by 398 798, that is all numbers such that the remainder of the division by 398 798 is zero. There are infinitely many multiples of 398 798. The smallest multiples of 398 798 are: