It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 490 478 is not a prime number.
For example, 490 478 can be divided by 2: 490 478 / 2 = 245 239.
For 490 478 to be a prime number, it would have been required that 490 478 has only two divisors, i.e., itself and 1.
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490 478 is an even number, because it is evenly divisible by 2: 490 478 / 2 = 245 239.
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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 490 478 is about 700.341.
Thus, the square root of 490 478 is not an integer, and therefore 490 478 is not a square number.
The square of a number (here 490 478) is the result of the product of this number (490 478) by itself (i.e., 490 478 × 490 478); the square of 490 478 is sometimes called "raising 490 478 to the power 2", or "490 478 squared".
The square of 490 478 is 240 568 668 484 because 490 478 × 490 478 = 490 4782 = 240 568 668 484.
As a consequence, 490 478 is the square root of 240 568 668 484.
The multiples of 490 478 are all integers evenly divisible by 490 478, that is all numbers such that the remainder of the division by 490 478 is zero. There are infinitely many multiples of 490 478. The smallest multiples of 490 478 are: