It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 165 259 021 is not a prime number.
For example, 165 259 021 can be divided by 307: 165 259 021 / 307 = 538 303.
For 165 259 021 to be a prime number, it would have been required that 165 259 021 has only two divisors, i.e., itself and 1.
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165 259 021 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 165 259 021 is about 12 855.311.
Thus, the square root of 165 259 021 is not an integer, and therefore 165 259 021 is not a square number.
The square of a number (here 165 259 021) is the result of the product of this number (165 259 021) by itself (i.e., 165 259 021 × 165 259 021); the square of 165 259 021 is sometimes called "raising 165 259 021 to the power 2", or "165 259 021 squared".
The square of 165 259 021 is 27 310 544 021 878 440 because 165 259 021 × 165 259 021 = 165 259 0212 = 27 310 544 021 878 440.
As a consequence, 165 259 021 is the square root of 27 310 544 021 878 440.
165 259 021 is a number with 9 digits.
The multiples of 165 259 021 are all integers evenly divisible by 165 259 021, that is all numbers such that the remainder of the division by 165 259 021 is zero. There are infinitely many multiples of 165 259 021. The smallest multiples of 165 259 021 are: