It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 505 616 is not a prime number.
For example, 505 616 can be divided by 2: 505 616 / 2 = 252 808.
For 505 616 to be a prime number, it would have been required that 505 616 has only two divisors, i.e., itself and 1.
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505 616 is an even number, because it is evenly divisible by 2: 505 616 / 2 = 252 808.
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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 505 616 is about 711.067.
Thus, the square root of 505 616 is not an integer, and therefore 505 616 is not a square number.
The square of a number (here 505 616) is the result of the product of this number (505 616) by itself (i.e., 505 616 × 505 616); the square of 505 616 is sometimes called "raising 505 616 to the power 2", or "505 616 squared".
The square of 505 616 is 255 647 539 456 because 505 616 × 505 616 = 505 6162 = 255 647 539 456.
As a consequence, 505 616 is the square root of 255 647 539 456.
The multiples of 505 616 are all integers evenly divisible by 505 616, that is all numbers such that the remainder of the division by 505 616 is zero. There are infinitely many multiples of 505 616. The smallest multiples of 505 616 are: