It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 520 219 518 is not a prime number.
For example, 520 219 518 can be divided by 2: 520 219 518 / 2 = 260 109 759.
For 520 219 518 to be a prime number, it would have been required that 520 219 518 has only two divisors, i.e., itself and 1.
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520 219 518 is an even number, because it is evenly divisible by 2: 520 219 518 / 2 = 260 109 759.
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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 520 219 518 is about 22 808.321.
Thus, the square root of 520 219 518 is not an integer, and therefore 520 219 518 is not a square number.
The square of a number (here 520 219 518) is the result of the product of this number (520 219 518) by itself (i.e., 520 219 518 × 520 219 518); the square of 520 219 518 is sometimes called "raising 520 219 518 to the power 2", or "520 219 518 squared".
The square of 520 219 518 is 270 628 346 908 152 320 because 520 219 518 × 520 219 518 = 520 219 5182 = 270 628 346 908 152 320.
As a consequence, 520 219 518 is the square root of 270 628 346 908 152 320.
520 219 518 is a number with 9 digits.
The multiples of 520 219 518 are all integers evenly divisible by 520 219 518, that is all numbers such that the remainder of the division by 520 219 518 is zero. There are infinitely many multiples of 520 219 518. The smallest multiples of 520 219 518 are: