It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 398 898 is not a prime number.
For example, 398 898 can be divided by 2: 398 898 / 2 = 199 449.
For 398 898 to be a prime number, it would have been required that 398 898 has only two divisors, i.e., itself and 1.
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398 898 is an even number, because it is evenly divisible by 2: 398 898 / 2 = 199 449.
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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 398 898 is about 631.584.
Thus, the square root of 398 898 is not an integer, and therefore 398 898 is not a square number.
The square of a number (here 398 898) is the result of the product of this number (398 898) by itself (i.e., 398 898 × 398 898); the square of 398 898 is sometimes called "raising 398 898 to the power 2", or "398 898 squared".
The square of 398 898 is 159 119 614 404 because 398 898 × 398 898 = 398 8982 = 159 119 614 404.
As a consequence, 398 898 is the square root of 159 119 614 404.
The multiples of 398 898 are all integers evenly divisible by 398 898, that is all numbers such that the remainder of the division by 398 898 is zero. There are infinitely many multiples of 398 898. The smallest multiples of 398 898 are: