It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 505 542 is not a prime number.
For example, 505 542 can be divided by 2: 505 542 / 2 = 252 771.
For 505 542 to be a prime number, it would have been required that 505 542 has only two divisors, i.e., itself and 1.
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505 542 is an even number, because it is evenly divisible by 2: 505 542 / 2 = 252 771.
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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 505 542 is about 711.015.
Thus, the square root of 505 542 is not an integer, and therefore 505 542 is not a square number.
The square of a number (here 505 542) is the result of the product of this number (505 542) by itself (i.e., 505 542 × 505 542); the square of 505 542 is sometimes called "raising 505 542 to the power 2", or "505 542 squared".
The square of 505 542 is 255 572 713 764 because 505 542 × 505 542 = 505 5422 = 255 572 713 764.
As a consequence, 505 542 is the square root of 255 572 713 764.
The multiples of 505 542 are all integers evenly divisible by 505 542, that is all numbers such that the remainder of the division by 505 542 is zero. There are infinitely many multiples of 505 542. The smallest multiples of 505 542 are: