It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 505 016 is not a prime number.
For example, 505 016 can be divided by 2: 505 016 / 2 = 252 508.
For 505 016 to be a prime number, it would have been required that 505 016 has only two divisors, i.e., itself and 1.
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505 016 is an even number, because it is evenly divisible by 2: 505 016 / 2 = 252 508.
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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 505 016 is about 710.645.
Thus, the square root of 505 016 is not an integer, and therefore 505 016 is not a square number.
The square of a number (here 505 016) is the result of the product of this number (505 016) by itself (i.e., 505 016 × 505 016); the square of 505 016 is sometimes called "raising 505 016 to the power 2", or "505 016 squared".
The square of 505 016 is 255 041 160 256 because 505 016 × 505 016 = 505 0162 = 255 041 160 256.
As a consequence, 505 016 is the square root of 255 041 160 256.
The multiples of 505 016 are all integers evenly divisible by 505 016, that is all numbers such that the remainder of the division by 505 016 is zero. There are infinitely many multiples of 505 016. The smallest multiples of 505 016 are: