It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 398 674 is not a prime number.
For example, 398 674 can be divided by 2: 398 674 / 2 = 199 337.
For 398 674 to be a prime number, it would have been required that 398 674 has only two divisors, i.e., itself and 1.
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398 674 is an even number, because it is evenly divisible by 2: 398 674 / 2 = 199 337.
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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 398 674 is about 631.406.
Thus, the square root of 398 674 is not an integer, and therefore 398 674 is not a square number.
The square of a number (here 398 674) is the result of the product of this number (398 674) by itself (i.e., 398 674 × 398 674); the square of 398 674 is sometimes called "raising 398 674 to the power 2", or "398 674 squared".
The square of 398 674 is 158 940 958 276 because 398 674 × 398 674 = 398 6742 = 158 940 958 276.
As a consequence, 398 674 is the square root of 158 940 958 276.
The multiples of 398 674 are all integers evenly divisible by 398 674, that is all numbers such that the remainder of the division by 398 674 is zero. There are infinitely many multiples of 398 674. The smallest multiples of 398 674 are: