It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 255 166 is not a prime number.
For example, 255 166 can be divided by 2: 255 166 / 2 = 127 583.
For 255 166 to be a prime number, it would have been required that 255 166 has only two divisors, i.e., itself and 1.
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255 166 is an even number, because it is evenly divisible by 2: 255 166 / 2 = 127 583.
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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 255 166 is about 505.140.
Thus, the square root of 255 166 is not an integer, and therefore 255 166 is not a square number.
The square of a number (here 255 166) is the result of the product of this number (255 166) by itself (i.e., 255 166 × 255 166); the square of 255 166 is sometimes called "raising 255 166 to the power 2", or "255 166 squared".
The square of 255 166 is 65 109 687 556 because 255 166 × 255 166 = 255 1662 = 65 109 687 556.
As a consequence, 255 166 is the square root of 65 109 687 556.
The multiples of 255 166 are all integers evenly divisible by 255 166, that is all numbers such that the remainder of the division by 255 166 is zero. There are infinitely many multiples of 255 166. The smallest multiples of 255 166 are: