It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 263 243 is not a prime number.
For example, 263 243 can be divided by 67: 263 243 / 67 = 3 929.
For 263 243 to be a prime number, it would have been required that 263 243 has only two divisors, i.e., itself and 1.
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263 243 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 263 243 is about 513.072.
Thus, the square root of 263 243 is not an integer, and therefore 263 243 is not a square number.
The square of a number (here 263 243) is the result of the product of this number (263 243) by itself (i.e., 263 243 × 263 243); the square of 263 243 is sometimes called "raising 263 243 to the power 2", or "263 243 squared".
The square of 263 243 is 69 296 877 049 because 263 243 × 263 243 = 263 2432 = 69 296 877 049.
As a consequence, 263 243 is the square root of 69 296 877 049.
The multiples of 263 243 are all integers evenly divisible by 263 243, that is all numbers such that the remainder of the division by 263 243 is zero. There are infinitely many multiples of 263 243. The smallest multiples of 263 243 are: