It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 102 398 is not a prime number.
For example, 102 398 can be divided by 2: 102 398 / 2 = 51 199.
For 102 398 to be a prime number, it would have been required that 102 398 has only two divisors, i.e., itself and 1.
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102 398 is an even number, because it is evenly divisible by 2: 102 398 / 2 = 51 199.
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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 102 398 is about 319.997.
Thus, the square root of 102 398 is not an integer, and therefore 102 398 is not a square number.
The square of a number (here 102 398) is the result of the product of this number (102 398) by itself (i.e., 102 398 × 102 398); the square of 102 398 is sometimes called "raising 102 398 to the power 2", or "102 398 squared".
The square of 102 398 is 10 485 350 404 because 102 398 × 102 398 = 102 3982 = 10 485 350 404.
As a consequence, 102 398 is the square root of 10 485 350 404.
The multiples of 102 398 are all integers evenly divisible by 102 398, that is all numbers such that the remainder of the division by 102 398 is zero. There are infinitely many multiples of 102 398. The smallest multiples of 102 398 are: