It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 166 666 is not a prime number.
For example, 166 666 can be divided by 2: 166 666 / 2 = 83 333.
For 166 666 to be a prime number, it would have been required that 166 666 has only two divisors, i.e., itself and 1.
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166 666 is an even number, because it is evenly divisible by 2: 166 666 / 2 = 83 333.
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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 166 666 is about 408.247.
Thus, the square root of 166 666 is not an integer, and therefore 166 666 is not a square number.
The square of a number (here 166 666) is the result of the product of this number (166 666) by itself (i.e., 166 666 × 166 666); the square of 166 666 is sometimes called "raising 166 666 to the power 2", or "166 666 squared".
The square of 166 666 is 27 777 555 556 because 166 666 × 166 666 = 166 6662 = 27 777 555 556.
As a consequence, 166 666 is the square root of 27 777 555 556.
The multiples of 166 666 are all integers evenly divisible by 166 666, that is all numbers such that the remainder of the division by 166 666 is zero. There are infinitely many multiples of 166 666. The smallest multiples of 166 666 are: