It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 340 398 is not a prime number.
For example, 340 398 can be divided by 2: 340 398 / 2 = 170 199.
For 340 398 to be a prime number, it would have been required that 340 398 has only two divisors, i.e., itself and 1.
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340 398 is an even number, because it is evenly divisible by 2: 340 398 / 2 = 170 199.
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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 340 398 is about 583.436.
Thus, the square root of 340 398 is not an integer, and therefore 340 398 is not a square number.
The square of a number (here 340 398) is the result of the product of this number (340 398) by itself (i.e., 340 398 × 340 398); the square of 340 398 is sometimes called "raising 340 398 to the power 2", or "340 398 squared".
The square of 340 398 is 115 870 798 404 because 340 398 × 340 398 = 340 3982 = 115 870 798 404.
As a consequence, 340 398 is the square root of 115 870 798 404.
The multiples of 340 398 are all integers evenly divisible by 340 398, that is all numbers such that the remainder of the division by 340 398 is zero. There are infinitely many multiples of 340 398. The smallest multiples of 340 398 are: