It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 238 is not a prime number.
For example, 518 238 can be divided by 2: 518 238 / 2 = 259 119.
For 518 238 to be a prime number, it would have been required that 518 238 has only two divisors, i.e., itself and 1.
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518 238 is an even number, because it is evenly divisible by 2: 518 238 / 2 = 259 119.
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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 518 238 is about 719.887.
Thus, the square root of 518 238 is not an integer, and therefore 518 238 is not a square number.
The square of a number (here 518 238) is the result of the product of this number (518 238) by itself (i.e., 518 238 × 518 238); the square of 518 238 is sometimes called "raising 518 238 to the power 2", or "518 238 squared".
The square of 518 238 is 268 570 624 644 because 518 238 × 518 238 = 518 2382 = 268 570 624 644.
As a consequence, 518 238 is the square root of 268 570 624 644.
The multiples of 518 238 are all integers evenly divisible by 518 238, that is all numbers such that the remainder of the division by 518 238 is zero. There are infinitely many multiples of 518 238. The smallest multiples of 518 238 are: