It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 398 629 362 is not a prime number.
For example, 398 629 362 can be divided by 2: 398 629 362 / 2 = 199 314 681.
For 398 629 362 to be a prime number, it would have been required that 398 629 362 has only two divisors, i.e., itself and 1.
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398 629 362 is an even number, because it is evenly divisible by 2: 398 629 362 / 2 = 199 314 681.
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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 398 629 362 is about 19 965.705.
Thus, the square root of 398 629 362 is not an integer, and therefore 398 629 362 is not a square number.
The square of a number (here 398 629 362) is the result of the product of this number (398 629 362) by itself (i.e., 398 629 362 × 398 629 362); the square of 398 629 362 is sometimes called "raising 398 629 362 to the power 2", or "398 629 362 squared".
The square of 398 629 362 is 158 905 368 248 527 040 because 398 629 362 × 398 629 362 = 398 629 3622 = 158 905 368 248 527 040.
As a consequence, 398 629 362 is the square root of 158 905 368 248 527 040.
398 629 362 is a number with 9 digits.
The multiples of 398 629 362 are all integers evenly divisible by 398 629 362, that is all numbers such that the remainder of the division by 398 629 362 is zero. There are infinitely many multiples of 398 629 362. The smallest multiples of 398 629 362 are: