It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 490 409 is not a prime number.
For example, 490 409 can be divided by 19: 490 409 / 19 = 25 811.
For 490 409 to be a prime number, it would have been required that 490 409 has only two divisors, i.e., itself and 1.
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490 409 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 490 409 is about 700.292.
Thus, the square root of 490 409 is not an integer, and therefore 490 409 is not a square number.
The square of a number (here 490 409) is the result of the product of this number (490 409) by itself (i.e., 490 409 × 490 409); the square of 490 409 is sometimes called "raising 490 409 to the power 2", or "490 409 squared".
The square of 490 409 is 240 500 987 281 because 490 409 × 490 409 = 490 4092 = 240 500 987 281.
As a consequence, 490 409 is the square root of 240 500 987 281.
The multiples of 490 409 are all integers evenly divisible by 490 409, that is all numbers such that the remainder of the division by 490 409 is zero. There are infinitely many multiples of 490 409. The smallest multiples of 490 409 are: