It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 789 678 is not a prime number.
For example, 6 789 678 can be divided by 2: 6 789 678 / 2 = 3 394 839.
For 6 789 678 to be a prime number, it would have been required that 6 789 678 has only two divisors, i.e., itself and 1.
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6 789 678 is an even number, because it is evenly divisible by 2: 6 789 678 / 2 = 3 394 839.
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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 6 789 678 is about 2 605.701.
Thus, the square root of 6 789 678 is not an integer, and therefore 6 789 678 is not a square number.
The square of a number (here 6 789 678) is the result of the product of this number (6 789 678) by itself (i.e., 6 789 678 × 6 789 678); the square of 6 789 678 is sometimes called "raising 6 789 678 to the power 2", or "6 789 678 squared".
The square of 6 789 678 is 46 099 727 343 684 because 6 789 678 × 6 789 678 = 6 789 6782 = 46 099 727 343 684.
As a consequence, 6 789 678 is the square root of 46 099 727 343 684.
The multiples of 6 789 678 are all integers evenly divisible by 6 789 678, that is all numbers such that the remainder of the division by 6 789 678 is zero. There are infinitely many multiples of 6 789 678. The smallest multiples of 6 789 678 are: