It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 521 009 is not a prime number.
For example, 5 521 009 can be divided by 13: 5 521 009 / 13 = 424 693.
For 5 521 009 to be a prime number, it would have been required that 5 521 009 has only two divisors, i.e., itself and 1.
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5 521 009 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 5 521 009 is about 2 349.683.
Thus, the square root of 5 521 009 is not an integer, and therefore 5 521 009 is not a square number.
The square of a number (here 5 521 009) is the result of the product of this number (5 521 009) by itself (i.e., 5 521 009 × 5 521 009); the square of 5 521 009 is sometimes called "raising 5 521 009 to the power 2", or "5 521 009 squared".
The square of 5 521 009 is 30 481 540 378 081 because 5 521 009 × 5 521 009 = 5 521 0092 = 30 481 540 378 081.
As a consequence, 5 521 009 is the square root of 30 481 540 378 081.
The multiples of 5 521 009 are all integers evenly divisible by 5 521 009, that is all numbers such that the remainder of the division by 5 521 009 is zero. There are infinitely many multiples of 5 521 009. The smallest multiples of 5 521 009 are: