It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 165 243 is not a prime number.
For example, 165 243 can be divided by 3: 165 243 / 3 = 55 081.
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For 165 243 to be a prime number, it would have been required that 165 243 has only two divisors, i.e., itself and 1.
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165 243 is an odd number, because it is not evenly divisible by 2.
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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 165 243 is about 406.501.
Thus, the square root of 165 243 is not an integer, and therefore 165 243 is not a square number.
The square of a number (here 165 243) is the result of the product of this number (165 243) by itself (i.e., 165 243 × 165 243); the square of 165 243 is sometimes called "raising 165 243 to the power 2", or "165 243 squared".
The square of 165 243 is 27 305 249 049 because 165 243 × 165 243 = 165 2432 = 27 305 249 049.
As a consequence, 165 243 is the square root of 27 305 249 049.
The multiples of 165 243 are all integers evenly divisible by 165 243, that is all numbers such that the remainder of the division by 165 243 is zero. There are infinitely many multiples of 165 243. The smallest multiples of 165 243 are: