It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 255 264 is not a prime number.
For example, 255 264 can be divided by 2: 255 264 / 2 = 127 632.
For 255 264 to be a prime number, it would have been required that 255 264 has only two divisors, i.e., itself and 1.
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255 264 is an even number, because it is evenly divisible by 2: 255 264 / 2 = 127 632.
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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 255 264 is about 505.237.
Thus, the square root of 255 264 is not an integer, and therefore 255 264 is not a square number.
The square of a number (here 255 264) is the result of the product of this number (255 264) by itself (i.e., 255 264 × 255 264); the square of 255 264 is sometimes called "raising 255 264 to the power 2", or "255 264 squared".
The square of 255 264 is 65 159 709 696 because 255 264 × 255 264 = 255 2642 = 65 159 709 696.
As a consequence, 255 264 is the square root of 65 159 709 696.
The multiples of 255 264 are all integers evenly divisible by 255 264, that is all numbers such that the remainder of the division by 255 264 is zero. There are infinitely many multiples of 255 264. The smallest multiples of 255 264 are: