It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 520 689 is not a prime number.
For example, 8 520 689 can be divided by 17: 8 520 689 / 17 = 501 217.
For 8 520 689 to be a prime number, it would have been required that 8 520 689 has only two divisors, i.e., itself and 1.
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8 520 689 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 8 520 689 is about 2 919.022.
Thus, the square root of 8 520 689 is not an integer, and therefore 8 520 689 is not a square number.
The square of a number (here 8 520 689) is the result of the product of this number (8 520 689) by itself (i.e., 8 520 689 × 8 520 689); the square of 8 520 689 is sometimes called "raising 8 520 689 to the power 2", or "8 520 689 squared".
The square of 8 520 689 is 72 602 141 034 721 because 8 520 689 × 8 520 689 = 8 520 6892 = 72 602 141 034 721.
As a consequence, 8 520 689 is the square root of 72 602 141 034 721.
The multiples of 8 520 689 are all integers evenly divisible by 8 520 689, that is all numbers such that the remainder of the division by 8 520 689 is zero. There are infinitely many multiples of 8 520 689. The smallest multiples of 8 520 689 are: