It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 409 is not a prime number.
For example, 491 409 can be divided by 3: 491 409 / 3 = 163 803.
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For 491 409 to be a prime number, it would have been required that 491 409 has only two divisors, i.e., itself and 1.
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491 409 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 491 409 is about 701.006.
Thus, the square root of 491 409 is not an integer, and therefore 491 409 is not a square number.
The square of a number (here 491 409) is the result of the product of this number (491 409) by itself (i.e., 491 409 × 491 409); the square of 491 409 is sometimes called "raising 491 409 to the power 2", or "491 409 squared".
The square of 491 409 is 241 482 805 281 because 491 409 × 491 409 = 491 4092 = 241 482 805 281.
As a consequence, 491 409 is the square root of 241 482 805 281.
The multiples of 491 409 are all integers evenly divisible by 491 409, that is all numbers such that the remainder of the division by 491 409 is zero. There are infinitely many multiples of 491 409. The smallest multiples of 491 409 are: