It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 216 231 is not a prime number.
For example, 216 231 can be divided by 3: 216 231 / 3 = 72 077.
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For 216 231 to be a prime number, it would have been required that 216 231 has only two divisors, i.e., itself and 1.
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216 231 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 216 231 is about 465.006.
Thus, the square root of 216 231 is not an integer, and therefore 216 231 is not a square number.
The square of a number (here 216 231) is the result of the product of this number (216 231) by itself (i.e., 216 231 × 216 231); the square of 216 231 is sometimes called "raising 216 231 to the power 2", or "216 231 squared".
The square of 216 231 is 46 755 845 361 because 216 231 × 216 231 = 216 2312 = 46 755 845 361.
As a consequence, 216 231 is the square root of 46 755 845 361.
The multiples of 216 231 are all integers evenly divisible by 216 231, that is all numbers such that the remainder of the division by 216 231 is zero. There are infinitely many multiples of 216 231. The smallest multiples of 216 231 are: