It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 398 102 is not a prime number.
For example, 398 102 can be divided by 2: 398 102 / 2 = 199 051.
For 398 102 to be a prime number, it would have been required that 398 102 has only two divisors, i.e., itself and 1.
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398 102 is an even number, because it is evenly divisible by 2: 398 102 / 2 = 199 051.
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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 398 102 is about 630.953.
Thus, the square root of 398 102 is not an integer, and therefore 398 102 is not a square number.
The square of a number (here 398 102) is the result of the product of this number (398 102) by itself (i.e., 398 102 × 398 102); the square of 398 102 is sometimes called "raising 398 102 to the power 2", or "398 102 squared".
The square of 398 102 is 158 485 202 404 because 398 102 × 398 102 = 398 1022 = 158 485 202 404.
As a consequence, 398 102 is the square root of 158 485 202 404.
The multiples of 398 102 are all integers evenly divisible by 398 102, that is all numbers such that the remainder of the division by 398 102 is zero. There are infinitely many multiples of 398 102. The smallest multiples of 398 102 are: