It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 194 is not a prime number.
For example, 518 194 can be divided by 2: 518 194 / 2 = 259 097.
For 518 194 to be a prime number, it would have been required that 518 194 has only two divisors, i.e., itself and 1.
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518 194 is an even number, because it is evenly divisible by 2: 518 194 / 2 = 259 097.
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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 518 194 is about 719.857.
Thus, the square root of 518 194 is not an integer, and therefore 518 194 is not a square number.
The square of a number (here 518 194) is the result of the product of this number (518 194) by itself (i.e., 518 194 × 518 194); the square of 518 194 is sometimes called "raising 518 194 to the power 2", or "518 194 squared".
The square of 518 194 is 268 525 021 636 because 518 194 × 518 194 = 518 1942 = 268 525 021 636.
As a consequence, 518 194 is the square root of 268 525 021 636.
The multiples of 518 194 are all integers evenly divisible by 518 194, that is all numbers such that the remainder of the division by 518 194 is zero. There are infinitely many multiples of 518 194. The smallest multiples of 518 194 are: