It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 398 338 is not a prime number.
For example, 398 338 can be divided by 2: 398 338 / 2 = 199 169.
For 398 338 to be a prime number, it would have been required that 398 338 has only two divisors, i.e., itself and 1.
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398 338 is an even number, because it is evenly divisible by 2: 398 338 / 2 = 199 169.
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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 398 338 is about 631.140.
Thus, the square root of 398 338 is not an integer, and therefore 398 338 is not a square number.
The square of a number (here 398 338) is the result of the product of this number (398 338) by itself (i.e., 398 338 × 398 338); the square of 398 338 is sometimes called "raising 398 338 to the power 2", or "398 338 squared".
The square of 398 338 is 158 673 162 244 because 398 338 × 398 338 = 398 3382 = 158 673 162 244.
As a consequence, 398 338 is the square root of 158 673 162 244.
The multiples of 398 338 are all integers evenly divisible by 398 338, that is all numbers such that the remainder of the division by 398 338 is zero. There are infinitely many multiples of 398 338. The smallest multiples of 398 338 are: