It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 242 518 is not a prime number.
For example, 242 518 can be divided by 2: 242 518 / 2 = 121 259.
For 242 518 to be a prime number, it would have been required that 242 518 has only two divisors, i.e., itself and 1.
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242 518 is an even number, because it is evenly divisible by 2: 242 518 / 2 = 121 259.
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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 242 518 is about 492.461.
Thus, the square root of 242 518 is not an integer, and therefore 242 518 is not a square number.
The square of a number (here 242 518) is the result of the product of this number (242 518) by itself (i.e., 242 518 × 242 518); the square of 242 518 is sometimes called "raising 242 518 to the power 2", or "242 518 squared".
The square of 242 518 is 58 814 980 324 because 242 518 × 242 518 = 242 5182 = 58 814 980 324.
As a consequence, 242 518 is the square root of 58 814 980 324.
The multiples of 242 518 are all integers evenly divisible by 242 518, that is all numbers such that the remainder of the division by 242 518 is zero. There are infinitely many multiples of 242 518. The smallest multiples of 242 518 are: