It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 609 261 is not a prime number.
For example, 491 609 261 can be divided by 11: 491 609 261 / 11 = 44 691 751.
For 491 609 261 to be a prime number, it would have been required that 491 609 261 has only two divisors, i.e., itself and 1.
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491 609 261 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 491 609 261 is about 22 172.263.
Thus, the square root of 491 609 261 is not an integer, and therefore 491 609 261 is not a square number.
The square of a number (here 491 609 261) is the result of the product of this number (491 609 261) by itself (i.e., 491 609 261 × 491 609 261); the square of 491 609 261 is sometimes called "raising 491 609 261 to the power 2", or "491 609 261 squared".
The square of 491 609 261 is 241 679 665 500 966 112 because 491 609 261 × 491 609 261 = 491 609 2612 = 241 679 665 500 966 112.
As a consequence, 491 609 261 is the square root of 241 679 665 500 966 112.
491 609 261 is a number with 9 digits.
The multiples of 491 609 261 are all integers evenly divisible by 491 609 261, that is all numbers such that the remainder of the division by 491 609 261 is zero. There are infinitely many multiples of 491 609 261. The smallest multiples of 491 609 261 are: