It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 66 009 is not a prime number.
For example, 66 009 can be divided by 3: 66 009 / 3 = 22 003.
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For 66 009 to be a prime number, it would have been required that 66 009 has only two divisors, i.e., itself and 1.
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66 009 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 66 009 is about 256.922.
Thus, the square root of 66 009 is not an integer, and therefore 66 009 is not a square number.
The square of a number (here 66 009) is the result of the product of this number (66 009) by itself (i.e., 66 009 × 66 009); the square of 66 009 is sometimes called "raising 66 009 to the power 2", or "66 009 squared".
The square of 66 009 is 4 357 188 081 because 66 009 × 66 009 = 66 0092 = 4 357 188 081.
As a consequence, 66 009 is the square root of 4 357 188 081.
The multiples of 66 009 are all integers evenly divisible by 66 009, that is all numbers such that the remainder of the division by 66 009 is zero. There are infinitely many multiples of 66 009. The smallest multiples of 66 009 are: