It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 164 398 is not a prime number.
For example, 164 398 can be divided by 2: 164 398 / 2 = 82 199.
For 164 398 to be a prime number, it would have been required that 164 398 has only two divisors, i.e., itself and 1.
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164 398 is an even number, because it is evenly divisible by 2: 164 398 / 2 = 82 199.
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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 164 398 is about 405.460.
Thus, the square root of 164 398 is not an integer, and therefore 164 398 is not a square number.
The square of a number (here 164 398) is the result of the product of this number (164 398) by itself (i.e., 164 398 × 164 398); the square of 164 398 is sometimes called "raising 164 398 to the power 2", or "164 398 squared".
The square of 164 398 is 27 026 702 404 because 164 398 × 164 398 = 164 3982 = 27 026 702 404.
As a consequence, 164 398 is the square root of 27 026 702 404.
The multiples of 164 398 are all integers evenly divisible by 164 398, that is all numbers such that the remainder of the division by 164 398 is zero. There are infinitely many multiples of 164 398. The smallest multiples of 164 398 are: