It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 209 389 is not a prime number.
For example, 5 209 389 can be divided by 3: 5 209 389 / 3 = 1 736 463.
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For 5 209 389 to be a prime number, it would have been required that 5 209 389 has only two divisors, i.e., itself and 1.
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5 209 389 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 5 209 389 is about 2 282.409.
Thus, the square root of 5 209 389 is not an integer, and therefore 5 209 389 is not a square number.
The square of a number (here 5 209 389) is the result of the product of this number (5 209 389) by itself (i.e., 5 209 389 × 5 209 389); the square of 5 209 389 is sometimes called "raising 5 209 389 to the power 2", or "5 209 389 squared".
The square of 5 209 389 is 27 137 733 753 321 because 5 209 389 × 5 209 389 = 5 209 3892 = 27 137 733 753 321.
As a consequence, 5 209 389 is the square root of 27 137 733 753 321.
The multiples of 5 209 389 are all integers evenly divisible by 5 209 389, that is all numbers such that the remainder of the division by 5 209 389 is zero. There are infinitely many multiples of 5 209 389. The smallest multiples of 5 209 389 are: