It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 398 988 is not a prime number.
For example, 398 988 can be divided by 2: 398 988 / 2 = 199 494.
For 398 988 to be a prime number, it would have been required that 398 988 has only two divisors, i.e., itself and 1.
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398 988 is an even number, because it is evenly divisible by 2: 398 988 / 2 = 199 494.
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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 398 988 is about 631.655.
Thus, the square root of 398 988 is not an integer, and therefore 398 988 is not a square number.
The square of a number (here 398 988) is the result of the product of this number (398 988) by itself (i.e., 398 988 × 398 988); the square of 398 988 is sometimes called "raising 398 988 to the power 2", or "398 988 squared".
The square of 398 988 is 159 191 424 144 because 398 988 × 398 988 = 398 9882 = 159 191 424 144.
As a consequence, 398 988 is the square root of 159 191 424 144.
The multiples of 398 988 are all integers evenly divisible by 398 988, that is all numbers such that the remainder of the division by 398 988 is zero. There are infinitely many multiples of 398 988. The smallest multiples of 398 988 are: