It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 490 509 is not a prime number.
For example, 490 509 can be divided by 3: 490 509 / 3 = 163 503.
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For 490 509 to be a prime number, it would have been required that 490 509 has only two divisors, i.e., itself and 1.
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490 509 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 490 509 is about 700.363.
Thus, the square root of 490 509 is not an integer, and therefore 490 509 is not a square number.
The square of a number (here 490 509) is the result of the product of this number (490 509) by itself (i.e., 490 509 × 490 509); the square of 490 509 is sometimes called "raising 490 509 to the power 2", or "490 509 squared".
The square of 490 509 is 240 599 079 081 because 490 509 × 490 509 = 490 5092 = 240 599 079 081.
As a consequence, 490 509 is the square root of 240 599 079 081.
The multiples of 490 509 are all integers evenly divisible by 490 509, that is all numbers such that the remainder of the division by 490 509 is zero. There are infinitely many multiples of 490 509. The smallest multiples of 490 509 are: