It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 398 424 is not a prime number.
For example, 398 424 can be divided by 2: 398 424 / 2 = 199 212.
For 398 424 to be a prime number, it would have been required that 398 424 has only two divisors, i.e., itself and 1.
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398 424 is an even number, because it is evenly divisible by 2: 398 424 / 2 = 199 212.
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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 398 424 is about 631.208.
Thus, the square root of 398 424 is not an integer, and therefore 398 424 is not a square number.
The square of a number (here 398 424) is the result of the product of this number (398 424) by itself (i.e., 398 424 × 398 424); the square of 398 424 is sometimes called "raising 398 424 to the power 2", or "398 424 squared".
The square of 398 424 is 158 741 683 776 because 398 424 × 398 424 = 398 4242 = 158 741 683 776.
As a consequence, 398 424 is the square root of 158 741 683 776.
The multiples of 398 424 are all integers evenly divisible by 398 424, that is all numbers such that the remainder of the division by 398 424 is zero. There are infinitely many multiples of 398 424. The smallest multiples of 398 424 are: