It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 66 666 is not a prime number.
For example, 66 666 can be divided by 2: 66 666 / 2 = 33 333.
For 66 666 to be a prime number, it would have been required that 66 666 has only two divisors, i.e., itself and 1.
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66 666 is an even number, because it is evenly divisible by 2: 66 666 / 2 = 33 333.
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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 66 666 is about 258.198.
Thus, the square root of 66 666 is not an integer, and therefore 66 666 is not a square number.
The square of a number (here 66 666) is the result of the product of this number (66 666) by itself (i.e., 66 666 × 66 666); the square of 66 666 is sometimes called "raising 66 666 to the power 2", or "66 666 squared".
The square of 66 666 is 4 444 355 556 because 66 666 × 66 666 = 66 6662 = 4 444 355 556.
As a consequence, 66 666 is the square root of 4 444 355 556.
The multiples of 66 666 are all integers evenly divisible by 66 666, that is all numbers such that the remainder of the division by 66 666 is zero. There are infinitely many multiples of 66 666. The smallest multiples of 66 666 are: