It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 54 439 is not a prime number.
For example, 54 439 can be divided by 7: 54 439 / 7 = 7 777.
For 54 439 to be a prime number, it would have been required that 54 439 has only two divisors, i.e., itself and 1.
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54 439 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 54 439 is about 233.322.
Thus, the square root of 54 439 is not an integer, and therefore 54 439 is not a square number.
The square of a number (here 54 439) is the result of the product of this number (54 439) by itself (i.e., 54 439 × 54 439); the square of 54 439 is sometimes called "raising 54 439 to the power 2", or "54 439 squared".
The square of 54 439 is 2 963 604 721 because 54 439 × 54 439 = 54 4392 = 2 963 604 721.
As a consequence, 54 439 is the square root of 2 963 604 721.
The multiples of 54 439 are all integers evenly divisible by 54 439, that is all numbers such that the remainder of the division by 54 439 is zero. There are infinitely many multiples of 54 439. The smallest multiples of 54 439 are: