It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 2 252 256 is not a prime number.
For example, 2 252 256 can be divided by 2: 2 252 256 / 2 = 1 126 128.
For 2 252 256 to be a prime number, it would have been required that 2 252 256 has only two divisors, i.e., itself and 1.
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2 252 256 is an even number, because it is evenly divisible by 2: 2 252 256 / 2 = 1 126 128.
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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 2 252 256 is about 1 500.752.
Thus, the square root of 2 252 256 is not an integer, and therefore 2 252 256 is not a square number.
The square of a number (here 2 252 256) is the result of the product of this number (2 252 256) by itself (i.e., 2 252 256 × 2 252 256); the square of 2 252 256 is sometimes called "raising 2 252 256 to the power 2", or "2 252 256 squared".
The square of 2 252 256 is 5 072 657 089 536 because 2 252 256 × 2 252 256 = 2 252 2562 = 5 072 657 089 536.
As a consequence, 2 252 256 is the square root of 5 072 657 089 536.
The multiples of 2 252 256 are all integers evenly divisible by 2 252 256, that is all numbers such that the remainder of the division by 2 252 256 is zero. There are infinitely many multiples of 2 252 256. The smallest multiples of 2 252 256 are: