It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 398 324 is not a prime number.
For example, 398 324 can be divided by 2: 398 324 / 2 = 199 162.
For 398 324 to be a prime number, it would have been required that 398 324 has only two divisors, i.e., itself and 1.
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398 324 is an even number, because it is evenly divisible by 2: 398 324 / 2 = 199 162.
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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 398 324 is about 631.129.
Thus, the square root of 398 324 is not an integer, and therefore 398 324 is not a square number.
The square of a number (here 398 324) is the result of the product of this number (398 324) by itself (i.e., 398 324 × 398 324); the square of 398 324 is sometimes called "raising 398 324 to the power 2", or "398 324 squared".
The square of 398 324 is 158 662 008 976 because 398 324 × 398 324 = 398 3242 = 158 662 008 976.
As a consequence, 398 324 is the square root of 158 662 008 976.
The multiples of 398 324 are all integers evenly divisible by 398 324, that is all numbers such that the remainder of the division by 398 324 is zero. There are infinitely many multiples of 398 324. The smallest multiples of 398 324 are: