It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 489 338 is not a prime number.
For example, 6 489 338 can be divided by 2: 6 489 338 / 2 = 3 244 669.
For 6 489 338 to be a prime number, it would have been required that 6 489 338 has only two divisors, i.e., itself and 1.
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6 489 338 is an even number, because it is evenly divisible by 2: 6 489 338 / 2 = 3 244 669.
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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 6 489 338 is about 2 547.418.
Thus, the square root of 6 489 338 is not an integer, and therefore 6 489 338 is not a square number.
The square of a number (here 6 489 338) is the result of the product of this number (6 489 338) by itself (i.e., 6 489 338 × 6 489 338); the square of 6 489 338 is sometimes called "raising 6 489 338 to the power 2", or "6 489 338 squared".
The square of 6 489 338 is 42 111 507 678 244 because 6 489 338 × 6 489 338 = 6 489 3382 = 42 111 507 678 244.
As a consequence, 6 489 338 is the square root of 42 111 507 678 244.
The multiples of 6 489 338 are all integers evenly divisible by 6 489 338, that is all numbers such that the remainder of the division by 6 489 338 is zero. There are infinitely many multiples of 6 489 338. The smallest multiples of 6 489 338 are: