It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 691 is not a prime number.
For example, 491 691 can be divided by 3: 491 691 / 3 = 163 897.
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For 491 691 to be a prime number, it would have been required that 491 691 has only two divisors, i.e., itself and 1.
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491 691 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 491 691 is about 701.207.
Thus, the square root of 491 691 is not an integer, and therefore 491 691 is not a square number.
The square of a number (here 491 691) is the result of the product of this number (491 691) by itself (i.e., 491 691 × 491 691); the square of 491 691 is sometimes called "raising 491 691 to the power 2", or "491 691 squared".
The square of 491 691 is 241 760 039 481 because 491 691 × 491 691 = 491 6912 = 241 760 039 481.
As a consequence, 491 691 is the square root of 241 760 039 481.
The multiples of 491 691 are all integers evenly divisible by 491 691, that is all numbers such that the remainder of the division by 491 691 is zero. There are infinitely many multiples of 491 691. The smallest multiples of 491 691 are: