It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 243 216 is not a prime number.
For example, 243 216 can be divided by 2: 243 216 / 2 = 121 608.
For 243 216 to be a prime number, it would have been required that 243 216 has only two divisors, i.e., itself and 1.
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243 216 is an even number, because it is evenly divisible by 2: 243 216 / 2 = 121 608.
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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 243 216 is about 493.169.
Thus, the square root of 243 216 is not an integer, and therefore 243 216 is not a square number.
The square of a number (here 243 216) is the result of the product of this number (243 216) by itself (i.e., 243 216 × 243 216); the square of 243 216 is sometimes called "raising 243 216 to the power 2", or "243 216 squared".
The square of 243 216 is 59 154 022 656 because 243 216 × 243 216 = 243 2162 = 59 154 022 656.
As a consequence, 243 216 is the square root of 59 154 022 656.
The multiples of 243 216 are all integers evenly divisible by 243 216, that is all numbers such that the remainder of the division by 243 216 is zero. There are infinitely many multiples of 243 216. The smallest multiples of 243 216 are: