It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 558 216 is not a prime number.
For example, 558 216 can be divided by 2: 558 216 / 2 = 279 108.
For 558 216 to be a prime number, it would have been required that 558 216 has only two divisors, i.e., itself and 1.
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558 216 is an even number, because it is evenly divisible by 2: 558 216 / 2 = 279 108.
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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 558 216 is about 747.139.
Thus, the square root of 558 216 is not an integer, and therefore 558 216 is not a square number.
The square of a number (here 558 216) is the result of the product of this number (558 216) by itself (i.e., 558 216 × 558 216); the square of 558 216 is sometimes called "raising 558 216 to the power 2", or "558 216 squared".
The square of 558 216 is 311 605 102 656 because 558 216 × 558 216 = 558 2162 = 311 605 102 656.
As a consequence, 558 216 is the square root of 311 605 102 656.
The multiples of 558 216 are all integers evenly divisible by 558 216, that is all numbers such that the remainder of the division by 558 216 is zero. There are infinitely many multiples of 558 216. The smallest multiples of 558 216 are: