It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 505 489 is not a prime number.
For example, 505 489 can be divided by 41: 505 489 / 41 = 12 329.
For 505 489 to be a prime number, it would have been required that 505 489 has only two divisors, i.e., itself and 1.
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505 489 is an odd number, because it is not evenly divisible by 2.
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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 505 489 is about 710.977.
Thus, the square root of 505 489 is not an integer, and therefore 505 489 is not a square number.
The square of a number (here 505 489) is the result of the product of this number (505 489) by itself (i.e., 505 489 × 505 489); the square of 505 489 is sometimes called "raising 505 489 to the power 2", or "505 489 squared".
The square of 505 489 is 255 519 129 121 because 505 489 × 505 489 = 505 4892 = 255 519 129 121.
As a consequence, 505 489 is the square root of 255 519 129 121.
The multiples of 505 489 are all integers evenly divisible by 505 489, that is all numbers such that the remainder of the division by 505 489 is zero. There are infinitely many multiples of 505 489. The smallest multiples of 505 489 are: