It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 129 609 is not a prime number.
For example, 5 129 609 can be divided by 1 361: 5 129 609 / 1361 = 3 769.
For 5 129 609 to be a prime number, it would have been required that 5 129 609 has only two divisors, i.e., itself and 1.
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5 129 609 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 5 129 609 is about 2 264.864.
Thus, the square root of 5 129 609 is not an integer, and therefore 5 129 609 is not a square number.
The square of a number (here 5 129 609) is the result of the product of this number (5 129 609) by itself (i.e., 5 129 609 × 5 129 609); the square of 5 129 609 is sometimes called "raising 5 129 609 to the power 2", or "5 129 609 squared".
The square of 5 129 609 is 26 312 888 492 881 because 5 129 609 × 5 129 609 = 5 129 6092 = 26 312 888 492 881.
As a consequence, 5 129 609 is the square root of 26 312 888 492 881.
The multiples of 5 129 609 are all integers evenly divisible by 5 129 609, that is all numbers such that the remainder of the division by 5 129 609 is zero. There are infinitely many multiples of 5 129 609. The smallest multiples of 5 129 609 are: