It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 9 165 518 is not a prime number.
For example, 9 165 518 can be divided by 2: 9 165 518 / 2 = 4 582 759.
For 9 165 518 to be a prime number, it would have been required that 9 165 518 has only two divisors, i.e., itself and 1.
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9 165 518 is an even number, because it is evenly divisible by 2: 9 165 518 / 2 = 4 582 759.
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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 9 165 518 is about 3 027.461.
Thus, the square root of 9 165 518 is not an integer, and therefore 9 165 518 is not a square number.
The square of a number (here 9 165 518) is the result of the product of this number (9 165 518) by itself (i.e., 9 165 518 × 9 165 518); the square of 9 165 518 is sometimes called "raising 9 165 518 to the power 2", or "9 165 518 squared".
The square of 9 165 518 is 84 006 720 208 324 because 9 165 518 × 9 165 518 = 9 165 5182 = 84 006 720 208 324.
As a consequence, 9 165 518 is the square root of 84 006 720 208 324.
The multiples of 9 165 518 are all integers evenly divisible by 9 165 518, that is all numbers such that the remainder of the division by 9 165 518 is zero. There are infinitely many multiples of 9 165 518. The smallest multiples of 9 165 518 are: