It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 40 409 609 is not a prime number.
For example, 40 409 609 can be divided by 409: 40 409 609 / 409 = 98 801.
For 40 409 609 to be a prime number, it would have been required that 40 409 609 has only two divisors, i.e., itself and 1.
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40 409 609 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 40 409 609 is about 6 356.855.
Thus, the square root of 40 409 609 is not an integer, and therefore 40 409 609 is not a square number.
The square of a number (here 40 409 609) is the result of the product of this number (40 409 609) by itself (i.e., 40 409 609 × 40 409 609); the square of 40 409 609 is sometimes called "raising 40 409 609 to the power 2", or "40 409 609 squared".
The square of 40 409 609 is 1 632 936 499 532 881 because 40 409 609 × 40 409 609 = 40 409 6092 = 1 632 936 499 532 881.
As a consequence, 40 409 609 is the square root of 1 632 936 499 532 881.
40 409 609 is a number with 8 digits.
The multiples of 40 409 609 are all integers evenly divisible by 40 409 609, that is all numbers such that the remainder of the division by 40 409 609 is zero. There are infinitely many multiples of 40 409 609. The smallest multiples of 40 409 609 are: