It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 66 018 is not a prime number.
For example, 66 018 can be divided by 2: 66 018 / 2 = 33 009.
For 66 018 to be a prime number, it would have been required that 66 018 has only two divisors, i.e., itself and 1.
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66 018 is an even number, because it is evenly divisible by 2: 66 018 / 2 = 33 009.
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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 66 018 is about 256.940.
Thus, the square root of 66 018 is not an integer, and therefore 66 018 is not a square number.
The square of a number (here 66 018) is the result of the product of this number (66 018) by itself (i.e., 66 018 × 66 018); the square of 66 018 is sometimes called "raising 66 018 to the power 2", or "66 018 squared".
The square of 66 018 is 4 358 376 324 because 66 018 × 66 018 = 66 0182 = 4 358 376 324.
As a consequence, 66 018 is the square root of 4 358 376 324.
The multiples of 66 018 are all integers evenly divisible by 66 018, that is all numbers such that the remainder of the division by 66 018 is zero. There are infinitely many multiples of 66 018. The smallest multiples of 66 018 are: