It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 539 609 is not a prime number.
For example, 6 539 609 can be divided by 991: 6 539 609 / 991 = 6 599.
For 6 539 609 to be a prime number, it would have been required that 6 539 609 has only two divisors, i.e., itself and 1.
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6 539 609 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 6 539 609 is about 2 557.266.
Thus, the square root of 6 539 609 is not an integer, and therefore 6 539 609 is not a square number.
The square of a number (here 6 539 609) is the result of the product of this number (6 539 609) by itself (i.e., 6 539 609 × 6 539 609); the square of 6 539 609 is sometimes called "raising 6 539 609 to the power 2", or "6 539 609 squared".
The square of 6 539 609 is 42 766 485 872 881 because 6 539 609 × 6 539 609 = 6 539 6092 = 42 766 485 872 881.
As a consequence, 6 539 609 is the square root of 42 766 485 872 881.
The multiples of 6 539 609 are all integers evenly divisible by 6 539 609, that is all numbers such that the remainder of the division by 6 539 609 is zero. There are infinitely many multiples of 6 539 609. The smallest multiples of 6 539 609 are: