It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 236 is not a prime number.
For example, 518 236 can be divided by 2: 518 236 / 2 = 259 118.
For 518 236 to be a prime number, it would have been required that 518 236 has only two divisors, i.e., itself and 1.
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518 236 is an even number, because it is evenly divisible by 2: 518 236 / 2 = 259 118.
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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 518 236 is about 719.886.
Thus, the square root of 518 236 is not an integer, and therefore 518 236 is not a square number.
The square of a number (here 518 236) is the result of the product of this number (518 236) by itself (i.e., 518 236 × 518 236); the square of 518 236 is sometimes called "raising 518 236 to the power 2", or "518 236 squared".
The square of 518 236 is 268 568 551 696 because 518 236 × 518 236 = 518 2362 = 268 568 551 696.
As a consequence, 518 236 is the square root of 268 568 551 696.
The multiples of 518 236 are all integers evenly divisible by 518 236, that is all numbers such that the remainder of the division by 518 236 is zero. There are infinitely many multiples of 518 236. The smallest multiples of 518 236 are: