It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 718 878 is not a prime number.
For example, 6 718 878 can be divided by 2: 6 718 878 / 2 = 3 359 439.
For 6 718 878 to be a prime number, it would have been required that 6 718 878 has only two divisors, i.e., itself and 1.
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6 718 878 is an even number, because it is evenly divisible by 2: 6 718 878 / 2 = 3 359 439.
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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 6 718 878 is about 2 592.080.
Thus, the square root of 6 718 878 is not an integer, and therefore 6 718 878 is not a square number.
The square of a number (here 6 718 878) is the result of the product of this number (6 718 878) by itself (i.e., 6 718 878 × 6 718 878); the square of 6 718 878 is sometimes called "raising 6 718 878 to the power 2", or "6 718 878 squared".
The square of 6 718 878 is 45 143 321 578 884 because 6 718 878 × 6 718 878 = 6 718 8782 = 45 143 321 578 884.
As a consequence, 6 718 878 is the square root of 45 143 321 578 884.
The multiples of 6 718 878 are all integers evenly divisible by 6 718 878, that is all numbers such that the remainder of the division by 6 718 878 is zero. There are infinitely many multiples of 6 718 878. The smallest multiples of 6 718 878 are: