It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 489 408 is not a prime number.
For example, 6 489 408 can be divided by 2: 6 489 408 / 2 = 3 244 704.
For 6 489 408 to be a prime number, it would have been required that 6 489 408 has only two divisors, i.e., itself and 1.
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6 489 408 is an even number, because it is evenly divisible by 2: 6 489 408 / 2 = 3 244 704.
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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 6 489 408 is about 2 547.432.
Thus, the square root of 6 489 408 is not an integer, and therefore 6 489 408 is not a square number.
The square of a number (here 6 489 408) is the result of the product of this number (6 489 408) by itself (i.e., 6 489 408 × 6 489 408); the square of 6 489 408 is sometimes called "raising 6 489 408 to the power 2", or "6 489 408 squared".
The square of 6 489 408 is 42 112 416 190 464 because 6 489 408 × 6 489 408 = 6 489 4082 = 42 112 416 190 464.
As a consequence, 6 489 408 is the square root of 42 112 416 190 464.
The multiples of 6 489 408 are all integers evenly divisible by 6 489 408, that is all numbers such that the remainder of the division by 6 489 408 is zero. There are infinitely many multiples of 6 489 408. The smallest multiples of 6 489 408 are: