It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 398 497 is not a prime number.
For example, 398 497 can be divided by 11: 398 497 / 11 = 36 227.
For 398 497 to be a prime number, it would have been required that 398 497 has only two divisors, i.e., itself and 1.
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398 497 is an odd number, because it is not evenly divisible by 2.
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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 398 497 is about 631.266.
Thus, the square root of 398 497 is not an integer, and therefore 398 497 is not a square number.
The square of a number (here 398 497) is the result of the product of this number (398 497) by itself (i.e., 398 497 × 398 497); the square of 398 497 is sometimes called "raising 398 497 to the power 2", or "398 497 squared".
The square of 398 497 is 158 799 859 009 because 398 497 × 398 497 = 398 4972 = 158 799 859 009.
As a consequence, 398 497 is the square root of 158 799 859 009.
The multiples of 398 497 are all integers evenly divisible by 398 497, that is all numbers such that the remainder of the division by 398 497 is zero. There are infinitely many multiples of 398 497. The smallest multiples of 398 497 are: