It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 240 218 is not a prime number.
For example, 240 218 can be divided by 2: 240 218 / 2 = 120 109.
For 240 218 to be a prime number, it would have been required that 240 218 has only two divisors, i.e., itself and 1.
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240 218 is an even number, because it is evenly divisible by 2: 240 218 / 2 = 120 109.
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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 240 218 is about 490.120.
Thus, the square root of 240 218 is not an integer, and therefore 240 218 is not a square number.
The square of a number (here 240 218) is the result of the product of this number (240 218) by itself (i.e., 240 218 × 240 218); the square of 240 218 is sometimes called "raising 240 218 to the power 2", or "240 218 squared".
The square of 240 218 is 57 704 687 524 because 240 218 × 240 218 = 240 2182 = 57 704 687 524.
As a consequence, 240 218 is the square root of 57 704 687 524.
The multiples of 240 218 are all integers evenly divisible by 240 218, that is all numbers such that the remainder of the division by 240 218 is zero. There are infinitely many multiples of 240 218. The smallest multiples of 240 218 are: