It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 398 242 508 is not a prime number.
For example, 398 242 508 can be divided by 2: 398 242 508 / 2 = 199 121 254.
For 398 242 508 to be a prime number, it would have been required that 398 242 508 has only two divisors, i.e., itself and 1.
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398 242 508 is an even number, because it is evenly divisible by 2: 398 242 508 / 2 = 199 121 254.
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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 398 242 508 is about 19 956.014.
Thus, the square root of 398 242 508 is not an integer, and therefore 398 242 508 is not a square number.
The square of a number (here 398 242 508) is the result of the product of this number (398 242 508) by itself (i.e., 398 242 508 × 398 242 508); the square of 398 242 508 is sometimes called "raising 398 242 508 to the power 2", or "398 242 508 squared".
The square of 398 242 508 is 158 597 095 178 130 048 because 398 242 508 × 398 242 508 = 398 242 5082 = 158 597 095 178 130 048.
As a consequence, 398 242 508 is the square root of 158 597 095 178 130 048.
398 242 508 is a number with 9 digits.
The multiples of 398 242 508 are all integers evenly divisible by 398 242 508, that is all numbers such that the remainder of the division by 398 242 508 is zero. There are infinitely many multiples of 398 242 508. The smallest multiples of 398 242 508 are: