It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 438 678 is not a prime number.
For example, 6 438 678 can be divided by 2: 6 438 678 / 2 = 3 219 339.
For 6 438 678 to be a prime number, it would have been required that 6 438 678 has only two divisors, i.e., itself and 1.
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6 438 678 is an even number, because it is evenly divisible by 2: 6 438 678 / 2 = 3 219 339.
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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 6 438 678 is about 2 537.455.
Thus, the square root of 6 438 678 is not an integer, and therefore 6 438 678 is not a square number.
The square of a number (here 6 438 678) is the result of the product of this number (6 438 678) by itself (i.e., 6 438 678 × 6 438 678); the square of 6 438 678 is sometimes called "raising 6 438 678 to the power 2", or "6 438 678 squared".
The square of 6 438 678 is 41 456 574 387 684 because 6 438 678 × 6 438 678 = 6 438 6782 = 41 456 574 387 684.
As a consequence, 6 438 678 is the square root of 41 456 574 387 684.
The multiples of 6 438 678 are all integers evenly divisible by 6 438 678, that is all numbers such that the remainder of the division by 6 438 678 is zero. There are infinitely many multiples of 6 438 678. The smallest multiples of 6 438 678 are: