It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 809 021 is not a prime number.
For example, 8 809 021 can be divided by 13: 8 809 021 / 13 = 677 617.
For 8 809 021 to be a prime number, it would have been required that 8 809 021 has only two divisors, i.e., itself and 1.
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8 809 021 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 8 809 021 is about 2 967.999.
Thus, the square root of 8 809 021 is not an integer, and therefore 8 809 021 is not a square number.
The square of a number (here 8 809 021) is the result of the product of this number (8 809 021) by itself (i.e., 8 809 021 × 8 809 021); the square of 8 809 021 is sometimes called "raising 8 809 021 to the power 2", or "8 809 021 squared".
The square of 8 809 021 is 77 598 850 978 441 because 8 809 021 × 8 809 021 = 8 809 0212 = 77 598 850 978 441.
As a consequence, 8 809 021 is the square root of 77 598 850 978 441.
The multiples of 8 809 021 are all integers evenly divisible by 8 809 021, that is all numbers such that the remainder of the division by 8 809 021 is zero. There are infinitely many multiples of 8 809 021. The smallest multiples of 8 809 021 are: