It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 255 216 is not a prime number.
For example, 255 216 can be divided by 2: 255 216 / 2 = 127 608.
For 255 216 to be a prime number, it would have been required that 255 216 has only two divisors, i.e., itself and 1.
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255 216 is an even number, because it is evenly divisible by 2: 255 216 / 2 = 127 608.
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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 255 216 is about 505.189.
Thus, the square root of 255 216 is not an integer, and therefore 255 216 is not a square number.
The square of a number (here 255 216) is the result of the product of this number (255 216) by itself (i.e., 255 216 × 255 216); the square of 255 216 is sometimes called "raising 255 216 to the power 2", or "255 216 squared".
The square of 255 216 is 65 135 206 656 because 255 216 × 255 216 = 255 2162 = 65 135 206 656.
As a consequence, 255 216 is the square root of 65 135 206 656.
The multiples of 255 216 are all integers evenly divisible by 255 216, that is all numbers such that the remainder of the division by 255 216 is zero. There are infinitely many multiples of 255 216. The smallest multiples of 255 216 are: