It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 366 918 is not a prime number.
For example, 366 918 can be divided by 2: 366 918 / 2 = 183 459.
For 366 918 to be a prime number, it would have been required that 366 918 has only two divisors, i.e., itself and 1.
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366 918 is an even number, because it is evenly divisible by 2: 366 918 / 2 = 183 459.
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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 366 918 is about 605.738.
Thus, the square root of 366 918 is not an integer, and therefore 366 918 is not a square number.
The square of a number (here 366 918) is the result of the product of this number (366 918) by itself (i.e., 366 918 × 366 918); the square of 366 918 is sometimes called "raising 366 918 to the power 2", or "366 918 squared".
The square of 366 918 is 134 628 818 724 because 366 918 × 366 918 = 366 9182 = 134 628 818 724.
As a consequence, 366 918 is the square root of 134 628 818 724.
The multiples of 366 918 are all integers evenly divisible by 366 918, that is all numbers such that the remainder of the division by 366 918 is zero. There are infinitely many multiples of 366 918. The smallest multiples of 366 918 are: