It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 398 698 is not a prime number.
For example, 398 698 can be divided by 2: 398 698 / 2 = 199 349.
For 398 698 to be a prime number, it would have been required that 398 698 has only two divisors, i.e., itself and 1.
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398 698 is an even number, because it is evenly divisible by 2: 398 698 / 2 = 199 349.
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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 398 698 is about 631.425.
Thus, the square root of 398 698 is not an integer, and therefore 398 698 is not a square number.
The square of a number (here 398 698) is the result of the product of this number (398 698) by itself (i.e., 398 698 × 398 698); the square of 398 698 is sometimes called "raising 398 698 to the power 2", or "398 698 squared".
The square of 398 698 is 158 960 095 204 because 398 698 × 398 698 = 398 6982 = 158 960 095 204.
As a consequence, 398 698 is the square root of 158 960 095 204.
The multiples of 398 698 are all integers evenly divisible by 398 698, that is all numbers such that the remainder of the division by 398 698 is zero. There are infinitely many multiples of 398 698. The smallest multiples of 398 698 are: