It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 255 774 016 is not a prime number.
For example, 255 774 016 can be divided by 2: 255 774 016 / 2 = 127 887 008.
For 255 774 016 to be a prime number, it would have been required that 255 774 016 has only two divisors, i.e., itself and 1.
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255 774 016 is an even number, because it is evenly divisible by 2: 255 774 016 / 2 = 127 887 008.
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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 255 774 016 is about 15 992.936.
Thus, the square root of 255 774 016 is not an integer, and therefore 255 774 016 is not a square number.
The square of a number (here 255 774 016) is the result of the product of this number (255 774 016) by itself (i.e., 255 774 016 × 255 774 016); the square of 255 774 016 is sometimes called "raising 255 774 016 to the power 2", or "255 774 016 squared".
The square of 255 774 016 is 65 420 347 260 768 256 because 255 774 016 × 255 774 016 = 255 774 0162 = 65 420 347 260 768 256.
As a consequence, 255 774 016 is the square root of 65 420 347 260 768 256.
255 774 016 is a number with 9 digits.
The multiples of 255 774 016 are all integers evenly divisible by 255 774 016, that is all numbers such that the remainder of the division by 255 774 016 is zero. There are infinitely many multiples of 255 774 016. The smallest multiples of 255 774 016 are: