It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 165 166 is not a prime number.
For example, 165 166 can be divided by 2: 165 166 / 2 = 82 583.
For 165 166 to be a prime number, it would have been required that 165 166 has only two divisors, i.e., itself and 1.
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165 166 is an even number, because it is evenly divisible by 2: 165 166 / 2 = 82 583.
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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 165 166 is about 406.406.
Thus, the square root of 165 166 is not an integer, and therefore 165 166 is not a square number.
The square of a number (here 165 166) is the result of the product of this number (165 166) by itself (i.e., 165 166 × 165 166); the square of 165 166 is sometimes called "raising 165 166 to the power 2", or "165 166 squared".
The square of 165 166 is 27 279 807 556 because 165 166 × 165 166 = 165 1662 = 27 279 807 556.
As a consequence, 165 166 is the square root of 27 279 807 556.
The multiples of 165 166 are all integers evenly divisible by 165 166, that is all numbers such that the remainder of the division by 165 166 is zero. There are infinitely many multiples of 165 166. The smallest multiples of 165 166 are: