It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 165 109 509 is not a prime number.
For example, 165 109 509 can be divided by 3: 165 109 509 / 3 = 55 036 503.
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For 165 109 509 to be a prime number, it would have been required that 165 109 509 has only two divisors, i.e., itself and 1.
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165 109 509 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 165 109 509 is about 12 849.495.
Thus, the square root of 165 109 509 is not an integer, and therefore 165 109 509 is not a square number.
The square of a number (here 165 109 509) is the result of the product of this number (165 109 509) by itself (i.e., 165 109 509 × 165 109 509); the square of 165 109 509 is sometimes called "raising 165 109 509 to the power 2", or "165 109 509 squared".
The square of 165 109 509 is 27 261 149 962 221 080 because 165 109 509 × 165 109 509 = 165 109 5092 = 27 261 149 962 221 080.
As a consequence, 165 109 509 is the square root of 27 261 149 962 221 080.
165 109 509 is a number with 9 digits.
The multiples of 165 109 509 are all integers evenly divisible by 165 109 509, that is all numbers such that the remainder of the division by 165 109 509 is zero. There are infinitely many multiples of 165 109 509. The smallest multiples of 165 109 509 are: