It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 640 309 is not a prime number.
For example, 491 640 309 can be divided by 3: 491 640 309 / 3 = 163 880 103.
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For 491 640 309 to be a prime number, it would have been required that 491 640 309 has only two divisors, i.e., itself and 1.
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491 640 309 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 491 640 309 is about 22 172.963.
Thus, the square root of 491 640 309 is not an integer, and therefore 491 640 309 is not a square number.
The square of a number (here 491 640 309) is the result of the product of this number (491 640 309) by itself (i.e., 491 640 309 × 491 640 309); the square of 491 640 309 is sometimes called "raising 491 640 309 to the power 2", or "491 640 309 squared".
The square of 491 640 309 is 241 710 193 433 615 488 because 491 640 309 × 491 640 309 = 491 640 3092 = 241 710 193 433 615 488.
As a consequence, 491 640 309 is the square root of 241 710 193 433 615 488.
491 640 309 is a number with 9 digits.
The multiples of 491 640 309 are all integers evenly divisible by 491 640 309, that is all numbers such that the remainder of the division by 491 640 309 is zero. There are infinitely many multiples of 491 640 309. The smallest multiples of 491 640 309 are: