It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 490 426 is not a prime number.
For example, 490 426 can be divided by 2: 490 426 / 2 = 245 213.
For 490 426 to be a prime number, it would have been required that 490 426 has only two divisors, i.e., itself and 1.
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490 426 is an even number, because it is evenly divisible by 2: 490 426 / 2 = 245 213.
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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 490 426 is about 700.304.
Thus, the square root of 490 426 is not an integer, and therefore 490 426 is not a square number.
The square of a number (here 490 426) is the result of the product of this number (490 426) by itself (i.e., 490 426 × 490 426); the square of 490 426 is sometimes called "raising 490 426 to the power 2", or "490 426 squared".
The square of 490 426 is 240 517 661 476 because 490 426 × 490 426 = 490 4262 = 240 517 661 476.
As a consequence, 490 426 is the square root of 240 517 661 476.
The multiples of 490 426 are all integers evenly divisible by 490 426, that is all numbers such that the remainder of the division by 490 426 is zero. There are infinitely many multiples of 490 426. The smallest multiples of 490 426 are: