It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 260 489 is not a prime number.
For example, 5 260 489 can be divided by 13: 5 260 489 / 13 = 404 653.
For 5 260 489 to be a prime number, it would have been required that 5 260 489 has only two divisors, i.e., itself and 1.
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5 260 489 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 5 260 489 is about 2 293.576.
Thus, the square root of 5 260 489 is not an integer, and therefore 5 260 489 is not a square number.
The square of a number (here 5 260 489) is the result of the product of this number (5 260 489) by itself (i.e., 5 260 489 × 5 260 489); the square of 5 260 489 is sometimes called "raising 5 260 489 to the power 2", or "5 260 489 squared".
The square of 5 260 489 is 27 672 744 519 121 because 5 260 489 × 5 260 489 = 5 260 4892 = 27 672 744 519 121.
As a consequence, 5 260 489 is the square root of 27 672 744 519 121.
The multiples of 5 260 489 are all integers evenly divisible by 5 260 489, that is all numbers such that the remainder of the division by 5 260 489 is zero. There are infinitely many multiples of 5 260 489. The smallest multiples of 5 260 489 are: