It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 516 338 is not a prime number.
For example, 516 338 can be divided by 2: 516 338 / 2 = 258 169.
For 516 338 to be a prime number, it would have been required that 516 338 has only two divisors, i.e., itself and 1.
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516 338 is an even number, because it is evenly divisible by 2: 516 338 / 2 = 258 169.
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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 516 338 is about 718.567.
Thus, the square root of 516 338 is not an integer, and therefore 516 338 is not a square number.
The square of a number (here 516 338) is the result of the product of this number (516 338) by itself (i.e., 516 338 × 516 338); the square of 516 338 is sometimes called "raising 516 338 to the power 2", or "516 338 squared".
The square of 516 338 is 266 604 930 244 because 516 338 × 516 338 = 516 3382 = 266 604 930 244.
As a consequence, 516 338 is the square root of 266 604 930 244.
The multiples of 516 338 are all integers evenly divisible by 516 338, that is all numbers such that the remainder of the division by 516 338 is zero. There are infinitely many multiples of 516 338. The smallest multiples of 516 338 are: