It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 12 018 is not a prime number.
For example, 12 018 can be divided by 2: 12 018 / 2 = 6 009.
For 12 018 to be a prime number, it would have been required that 12 018 has only two divisors, i.e., itself and 1.
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12 018 is an even number, because it is evenly divisible by 2: 12 018 / 2 = 6 009.
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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 12 018 is about 109.627.
Thus, the square root of 12 018 is not an integer, and therefore 12 018 is not a square number.
The square of a number (here 12 018) is the result of the product of this number (12 018) by itself (i.e., 12 018 × 12 018); the square of 12 018 is sometimes called "raising 12 018 to the power 2", or "12 018 squared".
The square of 12 018 is 144 432 324 because 12 018 × 12 018 = 12 0182 = 144 432 324.
As a consequence, 12 018 is the square root of 144 432 324.
The multiples of 12 018 are all integers evenly divisible by 12 018, that is all numbers such that the remainder of the division by 12 018 is zero. There are infinitely many multiples of 12 018. The smallest multiples of 12 018 are: