It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 9 109 409 is not a prime number.
For example, 9 109 409 can be divided by 443: 9 109 409 / 443 = 20 563.
For 9 109 409 to be a prime number, it would have been required that 9 109 409 has only two divisors, i.e., itself and 1.
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9 109 409 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 9 109 409 is about 3 018.180.
Thus, the square root of 9 109 409 is not an integer, and therefore 9 109 409 is not a square number.
The square of a number (here 9 109 409) is the result of the product of this number (9 109 409) by itself (i.e., 9 109 409 × 9 109 409); the square of 9 109 409 is sometimes called "raising 9 109 409 to the power 2", or "9 109 409 squared".
The square of 9 109 409 is 82 981 332 329 281 because 9 109 409 × 9 109 409 = 9 109 4092 = 82 981 332 329 281.
As a consequence, 9 109 409 is the square root of 82 981 332 329 281.
The multiples of 9 109 409 are all integers evenly divisible by 9 109 409, that is all numbers such that the remainder of the division by 9 109 409 is zero. There are infinitely many multiples of 9 109 409. The smallest multiples of 9 109 409 are: