It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 9 018 009 is not a prime number.
For example, 9 018 009 can be divided by 3: 9 018 009 / 3 = 3 006 003.
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For 9 018 009 to be a prime number, it would have been required that 9 018 009 has only two divisors, i.e., itself and 1.
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9 018 009 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 9 018 009 is 3 003.
Therefore, the square root of 9 018 009 is an integer, and as a consequence 9 018 009 is a perfect square.
The square of a number (here 9 018 009) is the result of the product of this number (9 018 009) by itself (i.e., 9 018 009 × 9 018 009); the square of 9 018 009 is sometimes called "raising 9 018 009 to the power 2", or "9 018 009 squared".
The square of 9 018 009 is 81 324 486 324 081 because 9 018 009 × 9 018 009 = 9 018 0092 = 81 324 486 324 081.
As a consequence, 9 018 009 is the square root of 81 324 486 324 081.
The multiples of 9 018 009 are all integers evenly divisible by 9 018 009, that is all numbers such that the remainder of the division by 9 018 009 is zero. There are infinitely many multiples of 9 018 009. The smallest multiples of 9 018 009 are: