It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 2 516 609 is not a prime number.
For example, 2 516 609 can be divided by 431: 2 516 609 / 431 = 5 839.
For 2 516 609 to be a prime number, it would have been required that 2 516 609 has only two divisors, i.e., itself and 1.
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2 516 609 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 2 516 609 is about 1 586.382.
Thus, the square root of 2 516 609 is not an integer, and therefore 2 516 609 is not a square number.
The square of a number (here 2 516 609) is the result of the product of this number (2 516 609) by itself (i.e., 2 516 609 × 2 516 609); the square of 2 516 609 is sometimes called "raising 2 516 609 to the power 2", or "2 516 609 squared".
The square of 2 516 609 is 6 333 320 858 881 because 2 516 609 × 2 516 609 = 2 516 6092 = 6 333 320 858 881.
As a consequence, 2 516 609 is the square root of 6 333 320 858 881.
The multiples of 2 516 609 are all integers evenly divisible by 2 516 609, that is all numbers such that the remainder of the division by 2 516 609 is zero. There are infinitely many multiples of 2 516 609. The smallest multiples of 2 516 609 are: