It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 240 518 is not a prime number.
For example, 240 518 can be divided by 2: 240 518 / 2 = 120 259.
For 240 518 to be a prime number, it would have been required that 240 518 has only two divisors, i.e., itself and 1.
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240 518 is an even number, because it is evenly divisible by 2: 240 518 / 2 = 120 259.
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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 240 518 is about 490.426.
Thus, the square root of 240 518 is not an integer, and therefore 240 518 is not a square number.
The square of a number (here 240 518) is the result of the product of this number (240 518) by itself (i.e., 240 518 × 240 518); the square of 240 518 is sometimes called "raising 240 518 to the power 2", or "240 518 squared".
The square of 240 518 is 57 848 908 324 because 240 518 × 240 518 = 240 5182 = 57 848 908 324.
As a consequence, 240 518 is the square root of 57 848 908 324.
The multiples of 240 518 are all integers evenly divisible by 240 518, that is all numbers such that the remainder of the division by 240 518 is zero. There are infinitely many multiples of 240 518. The smallest multiples of 240 518 are: