It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 398 018 is not a prime number.
For example, 398 018 can be divided by 2: 398 018 / 2 = 199 009.
For 398 018 to be a prime number, it would have been required that 398 018 has only two divisors, i.e., itself and 1.
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398 018 is an even number, because it is evenly divisible by 2: 398 018 / 2 = 199 009.
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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 398 018 is about 630.887.
Thus, the square root of 398 018 is not an integer, and therefore 398 018 is not a square number.
The square of a number (here 398 018) is the result of the product of this number (398 018) by itself (i.e., 398 018 × 398 018); the square of 398 018 is sometimes called "raising 398 018 to the power 2", or "398 018 squared".
The square of 398 018 is 158 418 328 324 because 398 018 × 398 018 = 398 0182 = 158 418 328 324.
As a consequence, 398 018 is the square root of 158 418 328 324.
The multiples of 398 018 are all integers evenly divisible by 398 018, that is all numbers such that the remainder of the division by 398 018 is zero. There are infinitely many multiples of 398 018. The smallest multiples of 398 018 are: