It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 509 499 021 is not a prime number.
For example, 509 499 021 can be divided by 3: 509 499 021 / 3 = 169 833 007.
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For 509 499 021 to be a prime number, it would have been required that 509 499 021 has only two divisors, i.e., itself and 1.
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509 499 021 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 509 499 021 is about 22 572.085.
Thus, the square root of 509 499 021 is not an integer, and therefore 509 499 021 is not a square number.
The square of a number (here 509 499 021) is the result of the product of this number (509 499 021) by itself (i.e., 509 499 021 × 509 499 021); the square of 509 499 021 is sometimes called "raising 509 499 021 to the power 2", or "509 499 021 squared".
The square of 509 499 021 is 259 589 252 399 958 432 because 509 499 021 × 509 499 021 = 509 499 0212 = 259 589 252 399 958 432.
As a consequence, 509 499 021 is the square root of 259 589 252 399 958 432.
509 499 021 is a number with 9 digits.
The multiples of 509 499 021 are all integers evenly divisible by 509 499 021, that is all numbers such that the remainder of the division by 509 499 021 is zero. There are infinitely many multiples of 509 499 021. The smallest multiples of 509 499 021 are: