It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 516 494 is not a prime number.
For example, 516 494 can be divided by 2: 516 494 / 2 = 258 247.
For 516 494 to be a prime number, it would have been required that 516 494 has only two divisors, i.e., itself and 1.
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516 494 is an even number, because it is evenly divisible by 2: 516 494 / 2 = 258 247.
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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 516 494 is about 718.675.
Thus, the square root of 516 494 is not an integer, and therefore 516 494 is not a square number.
The square of a number (here 516 494) is the result of the product of this number (516 494) by itself (i.e., 516 494 × 516 494); the square of 516 494 is sometimes called "raising 516 494 to the power 2", or "516 494 squared".
The square of 516 494 is 266 766 052 036 because 516 494 × 516 494 = 516 4942 = 266 766 052 036.
As a consequence, 516 494 is the square root of 266 766 052 036.
The multiples of 516 494 are all integers evenly divisible by 516 494, that is all numbers such that the remainder of the division by 516 494 is zero. There are infinitely many multiples of 516 494. The smallest multiples of 516 494 are: