It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 438 243 is not a prime number.
For example, 438 243 can be divided by 3: 438 243 / 3 = 146 081.
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For 438 243 to be a prime number, it would have been required that 438 243 has only two divisors, i.e., itself and 1.
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438 243 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 438 243 is about 661.999.
Thus, the square root of 438 243 is not an integer, and therefore 438 243 is not a square number.
The square of a number (here 438 243) is the result of the product of this number (438 243) by itself (i.e., 438 243 × 438 243); the square of 438 243 is sometimes called "raising 438 243 to the power 2", or "438 243 squared".
The square of 438 243 is 192 056 927 049 because 438 243 × 438 243 = 438 2432 = 192 056 927 049.
As a consequence, 438 243 is the square root of 192 056 927 049.
The multiples of 438 243 are all integers evenly divisible by 438 243, that is all numbers such that the remainder of the division by 438 243 is zero. There are infinitely many multiples of 438 243. The smallest multiples of 438 243 are: