It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 240 542 is not a prime number.
For example, 240 542 can be divided by 2: 240 542 / 2 = 120 271.
For 240 542 to be a prime number, it would have been required that 240 542 has only two divisors, i.e., itself and 1.
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240 542 is an even number, because it is evenly divisible by 2: 240 542 / 2 = 120 271.
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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 240 542 is about 490.451.
Thus, the square root of 240 542 is not an integer, and therefore 240 542 is not a square number.
The square of a number (here 240 542) is the result of the product of this number (240 542) by itself (i.e., 240 542 × 240 542); the square of 240 542 is sometimes called "raising 240 542 to the power 2", or "240 542 squared".
The square of 240 542 is 57 860 453 764 because 240 542 × 240 542 = 240 5422 = 57 860 453 764.
As a consequence, 240 542 is the square root of 57 860 453 764.
The multiples of 240 542 are all integers evenly divisible by 240 542, that is all numbers such that the remainder of the division by 240 542 is zero. There are infinitely many multiples of 240 542. The smallest multiples of 240 542 are: