It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 216 243 is not a prime number.
For example, 216 243 can be divided by 3: 216 243 / 3 = 72 081.
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For 216 243 to be a prime number, it would have been required that 216 243 has only two divisors, i.e., itself and 1.
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216 243 is an odd number, because it is not evenly divisible by 2.
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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 216 243 is about 465.019.
Thus, the square root of 216 243 is not an integer, and therefore 216 243 is not a square number.
The square of a number (here 216 243) is the result of the product of this number (216 243) by itself (i.e., 216 243 × 216 243); the square of 216 243 is sometimes called "raising 216 243 to the power 2", or "216 243 squared".
The square of 216 243 is 46 761 035 049 because 216 243 × 216 243 = 216 2432 = 46 761 035 049.
As a consequence, 216 243 is the square root of 46 761 035 049.
The multiples of 216 243 are all integers evenly divisible by 216 243, that is all numbers such that the remainder of the division by 216 243 is zero. There are infinitely many multiples of 216 243. The smallest multiples of 216 243 are: