It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 166 667 is not a prime number.
For example, 8 166 667 can be divided by 41: 8 166 667 / 41 = 199 187.
For 8 166 667 to be a prime number, it would have been required that 8 166 667 has only two divisors, i.e., itself and 1.
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8 166 667 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 8 166 667 is about 2 857.738.
Thus, the square root of 8 166 667 is not an integer, and therefore 8 166 667 is not a square number.
The square of a number (here 8 166 667) is the result of the product of this number (8 166 667) by itself (i.e., 8 166 667 × 8 166 667); the square of 8 166 667 is sometimes called "raising 8 166 667 to the power 2", or "8 166 667 squared".
The square of 8 166 667 is 66 694 449 888 889 because 8 166 667 × 8 166 667 = 8 166 6672 = 66 694 449 888 889.
As a consequence, 8 166 667 is the square root of 66 694 449 888 889.
The multiples of 8 166 667 are all integers evenly divisible by 8 166 667, that is all numbers such that the remainder of the division by 8 166 667 is zero. There are infinitely many multiples of 8 166 667. The smallest multiples of 8 166 667 are: