It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 558 018 is not a prime number.
For example, 558 018 can be divided by 2: 558 018 / 2 = 279 009.
For 558 018 to be a prime number, it would have been required that 558 018 has only two divisors, i.e., itself and 1.
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558 018 is an even number, because it is evenly divisible by 2: 558 018 / 2 = 279 009.
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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 558 018 is about 747.006.
Thus, the square root of 558 018 is not an integer, and therefore 558 018 is not a square number.
The square of a number (here 558 018) is the result of the product of this number (558 018) by itself (i.e., 558 018 × 558 018); the square of 558 018 is sometimes called "raising 558 018 to the power 2", or "558 018 squared".
The square of 558 018 is 311 384 088 324 because 558 018 × 558 018 = 558 0182 = 311 384 088 324.
As a consequence, 558 018 is the square root of 311 384 088 324.
The multiples of 558 018 are all integers evenly divisible by 558 018, that is all numbers such that the remainder of the division by 558 018 is zero. There are infinitely many multiples of 558 018. The smallest multiples of 558 018 are: