It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 255 242 is not a prime number.
For example, 255 242 can be divided by 2: 255 242 / 2 = 127 621.
For 255 242 to be a prime number, it would have been required that 255 242 has only two divisors, i.e., itself and 1.
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255 242 is an even number, because it is evenly divisible by 2: 255 242 / 2 = 127 621.
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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 255 242 is about 505.215.
Thus, the square root of 255 242 is not an integer, and therefore 255 242 is not a square number.
The square of a number (here 255 242) is the result of the product of this number (255 242) by itself (i.e., 255 242 × 255 242); the square of 255 242 is sometimes called "raising 255 242 to the power 2", or "255 242 squared".
The square of 255 242 is 65 148 478 564 because 255 242 × 255 242 = 255 2422 = 65 148 478 564.
As a consequence, 255 242 is the square root of 65 148 478 564.
The multiples of 255 242 are all integers evenly divisible by 255 242, that is all numbers such that the remainder of the division by 255 242 is zero. There are infinitely many multiples of 255 242. The smallest multiples of 255 242 are: