It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 495 494 is not a prime number.
For example, 495 494 can be divided by 2: 495 494 / 2 = 247 747.
For 495 494 to be a prime number, it would have been required that 495 494 has only two divisors, i.e., itself and 1.
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495 494 is an even number, because it is evenly divisible by 2: 495 494 / 2 = 247 747.
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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 495 494 is about 703.913.
Thus, the square root of 495 494 is not an integer, and therefore 495 494 is not a square number.
The square of a number (here 495 494) is the result of the product of this number (495 494) by itself (i.e., 495 494 × 495 494); the square of 495 494 is sometimes called "raising 495 494 to the power 2", or "495 494 squared".
The square of 495 494 is 245 514 304 036 because 495 494 × 495 494 = 495 4942 = 245 514 304 036.
As a consequence, 495 494 is the square root of 245 514 304 036.
The multiples of 495 494 are all integers evenly divisible by 495 494, that is all numbers such that the remainder of the division by 495 494 is zero. There are infinitely many multiples of 495 494. The smallest multiples of 495 494 are: