It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 490 691 is not a prime number.
For example, 490 691 can be divided by 181: 490 691 / 181 = 2 711.
For 490 691 to be a prime number, it would have been required that 490 691 has only two divisors, i.e., itself and 1.
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490 691 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 490 691 is about 700.493.
Thus, the square root of 490 691 is not an integer, and therefore 490 691 is not a square number.
The square of a number (here 490 691) is the result of the product of this number (490 691) by itself (i.e., 490 691 × 490 691); the square of 490 691 is sometimes called "raising 490 691 to the power 2", or "490 691 squared".
The square of 490 691 is 240 777 657 481 because 490 691 × 490 691 = 490 6912 = 240 777 657 481.
As a consequence, 490 691 is the square root of 240 777 657 481.
The multiples of 490 691 are all integers evenly divisible by 490 691, that is all numbers such that the remainder of the division by 490 691 is zero. There are infinitely many multiples of 490 691. The smallest multiples of 490 691 are: