It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 209 is not a prime number.
For example, 491 209 can be divided by 409: 491 209 / 409 = 1 201.
For 491 209 to be a prime number, it would have been required that 491 209 has only two divisors, i.e., itself and 1.
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491 209 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 491 209 is about 700.863.
Thus, the square root of 491 209 is not an integer, and therefore 491 209 is not a square number.
The square of a number (here 491 209) is the result of the product of this number (491 209) by itself (i.e., 491 209 × 491 209); the square of 491 209 is sometimes called "raising 491 209 to the power 2", or "491 209 squared".
The square of 491 209 is 241 286 281 681 because 491 209 × 491 209 = 491 2092 = 241 286 281 681.
As a consequence, 491 209 is the square root of 241 286 281 681.
The multiples of 491 209 are all integers evenly divisible by 491 209, that is all numbers such that the remainder of the division by 491 209 is zero. There are infinitely many multiples of 491 209. The smallest multiples of 491 209 are: