It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 128 216 is not a prime number.
For example, 128 216 can be divided by 2: 128 216 / 2 = 64 108.
For 128 216 to be a prime number, it would have been required that 128 216 has only two divisors, i.e., itself and 1.
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128 216 is an even number, because it is evenly divisible by 2: 128 216 / 2 = 64 108.
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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 128 216 is about 358.073.
Thus, the square root of 128 216 is not an integer, and therefore 128 216 is not a square number.
The square of a number (here 128 216) is the result of the product of this number (128 216) by itself (i.e., 128 216 × 128 216); the square of 128 216 is sometimes called "raising 128 216 to the power 2", or "128 216 squared".
The square of 128 216 is 16 439 342 656 because 128 216 × 128 216 = 128 2162 = 16 439 342 656.
As a consequence, 128 216 is the square root of 16 439 342 656.
The multiples of 128 216 are all integers evenly divisible by 128 216, that is all numbers such that the remainder of the division by 128 216 is zero. There are infinitely many multiples of 128 216. The smallest multiples of 128 216 are: