It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 135 216 is not a prime number.
For example, 135 216 can be divided by 2: 135 216 / 2 = 67 608.
For 135 216 to be a prime number, it would have been required that 135 216 has only two divisors, i.e., itself and 1.
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135 216 is an even number, because it is evenly divisible by 2: 135 216 / 2 = 67 608.
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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 135 216 is about 367.717.
Thus, the square root of 135 216 is not an integer, and therefore 135 216 is not a square number.
The square of a number (here 135 216) is the result of the product of this number (135 216) by itself (i.e., 135 216 × 135 216); the square of 135 216 is sometimes called "raising 135 216 to the power 2", or "135 216 squared".
The square of 135 216 is 18 283 366 656 because 135 216 × 135 216 = 135 2162 = 18 283 366 656.
As a consequence, 135 216 is the square root of 18 283 366 656.
The multiples of 135 216 are all integers evenly divisible by 135 216, that is all numbers such that the remainder of the division by 135 216 is zero. There are infinitely many multiples of 135 216. The smallest multiples of 135 216 are: