It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 505 216 is not a prime number.
For example, 505 216 can be divided by 2: 505 216 / 2 = 252 608.
For 505 216 to be a prime number, it would have been required that 505 216 has only two divisors, i.e., itself and 1.
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505 216 is an even number, because it is evenly divisible by 2: 505 216 / 2 = 252 608.
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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 505 216 is about 710.785.
Thus, the square root of 505 216 is not an integer, and therefore 505 216 is not a square number.
The square of a number (here 505 216) is the result of the product of this number (505 216) by itself (i.e., 505 216 × 505 216); the square of 505 216 is sometimes called "raising 505 216 to the power 2", or "505 216 squared".
The square of 505 216 is 255 243 206 656 because 505 216 × 505 216 = 505 2162 = 255 243 206 656.
As a consequence, 505 216 is the square root of 255 243 206 656.
The multiples of 505 216 are all integers evenly divisible by 505 216, that is all numbers such that the remainder of the division by 505 216 is zero. There are infinitely many multiples of 505 216. The smallest multiples of 505 216 are: