It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 439 999 is not a prime number.
For example, 6 439 999 can be divided by 151: 6 439 999 / 151 = 42 649.
For 6 439 999 to be a prime number, it would have been required that 6 439 999 has only two divisors, i.e., itself and 1.
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6 439 999 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 6 439 999 is about 2 537.715.
Thus, the square root of 6 439 999 is not an integer, and therefore 6 439 999 is not a square number.
The square of a number (here 6 439 999) is the result of the product of this number (6 439 999) by itself (i.e., 6 439 999 × 6 439 999); the square of 6 439 999 is sometimes called "raising 6 439 999 to the power 2", or "6 439 999 squared".
The square of 6 439 999 is 41 473 587 120 001 because 6 439 999 × 6 439 999 = 6 439 9992 = 41 473 587 120 001.
As a consequence, 6 439 999 is the square root of 41 473 587 120 001.
The multiples of 6 439 999 are all integers evenly divisible by 6 439 999, that is all numbers such that the remainder of the division by 6 439 999 is zero. There are infinitely many multiples of 6 439 999. The smallest multiples of 6 439 999 are: