It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 264 243 is not a prime number.
For example, 264 243 can be divided by 3: 264 243 / 3 = 88 081.
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For 264 243 to be a prime number, it would have been required that 264 243 has only two divisors, i.e., itself and 1.
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264 243 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 264 243 is about 514.046.
Thus, the square root of 264 243 is not an integer, and therefore 264 243 is not a square number.
The square of a number (here 264 243) is the result of the product of this number (264 243) by itself (i.e., 264 243 × 264 243); the square of 264 243 is sometimes called "raising 264 243 to the power 2", or "264 243 squared".
The square of 264 243 is 69 824 363 049 because 264 243 × 264 243 = 264 2432 = 69 824 363 049.
As a consequence, 264 243 is the square root of 69 824 363 049.
The multiples of 264 243 are all integers evenly divisible by 264 243, that is all numbers such that the remainder of the division by 264 243 is zero. There are infinitely many multiples of 264 243. The smallest multiples of 264 243 are: