It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 2 009 423 is not a prime number.
For example, 2 009 423 can be divided by 13: 2 009 423 / 13 = 154 571.
For 2 009 423 to be a prime number, it would have been required that 2 009 423 has only two divisors, i.e., itself and 1.
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2 009 423 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 2 009 423 is about 1 417.541.
Thus, the square root of 2 009 423 is not an integer, and therefore 2 009 423 is not a square number.
The square of a number (here 2 009 423) is the result of the product of this number (2 009 423) by itself (i.e., 2 009 423 × 2 009 423); the square of 2 009 423 is sometimes called "raising 2 009 423 to the power 2", or "2 009 423 squared".
The square of 2 009 423 is 4 037 780 792 929 because 2 009 423 × 2 009 423 = 2 009 4232 = 4 037 780 792 929.
As a consequence, 2 009 423 is the square root of 4 037 780 792 929.
The multiples of 2 009 423 are all integers evenly divisible by 2 009 423, that is all numbers such that the remainder of the division by 2 009 423 is zero. There are infinitely many multiples of 2 009 423. The smallest multiples of 2 009 423 are: