It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 409 909 067 is not a prime number.
For example, 409 909 067 can be divided by 43: 409 909 067 / 43 = 9 532 769.
For 409 909 067 to be a prime number, it would have been required that 409 909 067 has only two divisors, i.e., itself and 1.
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409 909 067 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 409 909 067 is about 20 246.211.
Thus, the square root of 409 909 067 is not an integer, and therefore 409 909 067 is not a square number.
The square of a number (here 409 909 067) is the result of the product of this number (409 909 067) by itself (i.e., 409 909 067 × 409 909 067); the square of 409 909 067 is sometimes called "raising 409 909 067 to the power 2", or "409 909 067 squared".
The square of 409 909 067 is 168 025 443 208 810 496 because 409 909 067 × 409 909 067 = 409 909 0672 = 168 025 443 208 810 496.
As a consequence, 409 909 067 is the square root of 168 025 443 208 810 496.
409 909 067 is a number with 9 digits.
The multiples of 409 909 067 are all integers evenly divisible by 409 909 067, that is all numbers such that the remainder of the division by 409 909 067 is zero. There are infinitely many multiples of 409 909 067. The smallest multiples of 409 909 067 are: