It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 273 216 is not a prime number.
For example, 273 216 can be divided by 2: 273 216 / 2 = 136 608.
For 273 216 to be a prime number, it would have been required that 273 216 has only two divisors, i.e., itself and 1.
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273 216 is an even number, because it is evenly divisible by 2: 273 216 / 2 = 136 608.
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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 273 216 is about 522.701.
Thus, the square root of 273 216 is not an integer, and therefore 273 216 is not a square number.
The square of a number (here 273 216) is the result of the product of this number (273 216) by itself (i.e., 273 216 × 273 216); the square of 273 216 is sometimes called "raising 273 216 to the power 2", or "273 216 squared".
The square of 273 216 is 74 646 982 656 because 273 216 × 273 216 = 273 2162 = 74 646 982 656.
As a consequence, 273 216 is the square root of 74 646 982 656.
The multiples of 273 216 are all integers evenly divisible by 273 216, that is all numbers such that the remainder of the division by 273 216 is zero. There are infinitely many multiples of 273 216. The smallest multiples of 273 216 are: