It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 161 171 is not a prime number.
For example, 5 161 171 can be divided by 409: 5 161 171 / 409 = 12 619.
For 5 161 171 to be a prime number, it would have been required that 5 161 171 has only two divisors, i.e., itself and 1.
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5 161 171 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 5 161 171 is about 2 271.821.
Thus, the square root of 5 161 171 is not an integer, and therefore 5 161 171 is not a square number.
The square of a number (here 5 161 171) is the result of the product of this number (5 161 171) by itself (i.e., 5 161 171 × 5 161 171); the square of 5 161 171 is sometimes called "raising 5 161 171 to the power 2", or "5 161 171 squared".
The square of 5 161 171 is 26 637 686 091 241 because 5 161 171 × 5 161 171 = 5 161 1712 = 26 637 686 091 241.
As a consequence, 5 161 171 is the square root of 26 637 686 091 241.
The multiples of 5 161 171 are all integers evenly divisible by 5 161 171, that is all numbers such that the remainder of the division by 5 161 171 is zero. There are infinitely many multiples of 5 161 171. The smallest multiples of 5 161 171 are: