It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 166 518 is not a prime number.
For example, 166 518 can be divided by 2: 166 518 / 2 = 83 259.
For 166 518 to be a prime number, it would have been required that 166 518 has only two divisors, i.e., itself and 1.
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166 518 is an even number, because it is evenly divisible by 2: 166 518 / 2 = 83 259.
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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 166 518 is about 408.066.
Thus, the square root of 166 518 is not an integer, and therefore 166 518 is not a square number.
The square of a number (here 166 518) is the result of the product of this number (166 518) by itself (i.e., 166 518 × 166 518); the square of 166 518 is sometimes called "raising 166 518 to the power 2", or "166 518 squared".
The square of 166 518 is 27 728 244 324 because 166 518 × 166 518 = 166 5182 = 27 728 244 324.
As a consequence, 166 518 is the square root of 27 728 244 324.
The multiples of 166 518 are all integers evenly divisible by 166 518, that is all numbers such that the remainder of the division by 166 518 is zero. There are infinitely many multiples of 166 518. The smallest multiples of 166 518 are: