It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 209 642 is not a prime number.
For example, 5 209 642 can be divided by 2: 5 209 642 / 2 = 2 604 821.
For 5 209 642 to be a prime number, it would have been required that 5 209 642 has only two divisors, i.e., itself and 1.
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5 209 642 is an even number, because it is evenly divisible by 2: 5 209 642 / 2 = 2 604 821.
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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 5 209 642 is about 2 282.464.
Thus, the square root of 5 209 642 is not an integer, and therefore 5 209 642 is not a square number.
The square of a number (here 5 209 642) is the result of the product of this number (5 209 642) by itself (i.e., 5 209 642 × 5 209 642); the square of 5 209 642 is sometimes called "raising 5 209 642 to the power 2", or "5 209 642 squared".
The square of 5 209 642 is 27 140 369 768 164 because 5 209 642 × 5 209 642 = 5 209 6422 = 27 140 369 768 164.
As a consequence, 5 209 642 is the square root of 27 140 369 768 164.
The multiples of 5 209 642 are all integers evenly divisible by 5 209 642, that is all numbers such that the remainder of the division by 5 209 642 is zero. There are infinitely many multiples of 5 209 642. The smallest multiples of 5 209 642 are: