It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 240 258 is not a prime number.
For example, 240 258 can be divided by 2: 240 258 / 2 = 120 129.
For 240 258 to be a prime number, it would have been required that 240 258 has only two divisors, i.e., itself and 1.
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240 258 is an even number, because it is evenly divisible by 2: 240 258 / 2 = 120 129.
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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 240 258 is about 490.161.
Thus, the square root of 240 258 is not an integer, and therefore 240 258 is not a square number.
The square of a number (here 240 258) is the result of the product of this number (240 258) by itself (i.e., 240 258 × 240 258); the square of 240 258 is sometimes called "raising 240 258 to the power 2", or "240 258 squared".
The square of 240 258 is 57 723 906 564 because 240 258 × 240 258 = 240 2582 = 57 723 906 564.
As a consequence, 240 258 is the square root of 57 723 906 564.
The multiples of 240 258 are all integers evenly divisible by 240 258, that is all numbers such that the remainder of the division by 240 258 is zero. There are infinitely many multiples of 240 258. The smallest multiples of 240 258 are: