It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 165 398 is not a prime number.
For example, 165 398 can be divided by 2: 165 398 / 2 = 82 699.
For 165 398 to be a prime number, it would have been required that 165 398 has only two divisors, i.e., itself and 1.
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165 398 is an even number, because it is evenly divisible by 2: 165 398 / 2 = 82 699.
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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 165 398 is about 406.692.
Thus, the square root of 165 398 is not an integer, and therefore 165 398 is not a square number.
The square of a number (here 165 398) is the result of the product of this number (165 398) by itself (i.e., 165 398 × 165 398); the square of 165 398 is sometimes called "raising 165 398 to the power 2", or "165 398 squared".
The square of 165 398 is 27 356 498 404 because 165 398 × 165 398 = 165 3982 = 27 356 498 404.
As a consequence, 165 398 is the square root of 27 356 498 404.
The multiples of 165 398 are all integers evenly divisible by 165 398, that is all numbers such that the remainder of the division by 165 398 is zero. There are infinitely many multiples of 165 398. The smallest multiples of 165 398 are: