It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 518 161 is not a prime number.
For example, 518 161 can be divided by 7: 518 161 / 7 = 74 023.
For 518 161 to be a prime number, it would have been required that 518 161 has only two divisors, i.e., itself and 1.
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518 161 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 518 161 is about 719.834.
Thus, the square root of 518 161 is not an integer, and therefore 518 161 is not a square number.
The square of a number (here 518 161) is the result of the product of this number (518 161) by itself (i.e., 518 161 × 518 161); the square of 518 161 is sometimes called "raising 518 161 to the power 2", or "518 161 squared".
The square of 518 161 is 268 490 821 921 because 518 161 × 518 161 = 518 1612 = 268 490 821 921.
As a consequence, 518 161 is the square root of 268 490 821 921.
The multiples of 518 161 are all integers evenly divisible by 518 161, that is all numbers such that the remainder of the division by 518 161 is zero. There are infinitely many multiples of 518 161. The smallest multiples of 518 161 are: