It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 156 521 is not a prime number.
For example, 5 156 521 can be divided by 67: 5 156 521 / 67 = 76 963.
For 5 156 521 to be a prime number, it would have been required that 5 156 521 has only two divisors, i.e., itself and 1.
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5 156 521 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 5 156 521 is about 2 270.797.
Thus, the square root of 5 156 521 is not an integer, and therefore 5 156 521 is not a square number.
The square of a number (here 5 156 521) is the result of the product of this number (5 156 521) by itself (i.e., 5 156 521 × 5 156 521); the square of 5 156 521 is sometimes called "raising 5 156 521 to the power 2", or "5 156 521 squared".
The square of 5 156 521 is 26 589 708 823 441 because 5 156 521 × 5 156 521 = 5 156 5212 = 26 589 708 823 441.
As a consequence, 5 156 521 is the square root of 26 589 708 823 441.
The multiples of 5 156 521 are all integers evenly divisible by 5 156 521, that is all numbers such that the remainder of the division by 5 156 521 is zero. There are infinitely many multiples of 5 156 521. The smallest multiples of 5 156 521 are: