It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 7 678 439 is not a prime number.
For example, 7 678 439 can be divided by 41: 7 678 439 / 41 = 187 279.
For 7 678 439 to be a prime number, it would have been required that 7 678 439 has only two divisors, i.e., itself and 1.
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7 678 439 is an odd number, because it is not evenly divisible by 2.
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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 7 678 439 is about 2 771.000.
Thus, the square root of 7 678 439 is not an integer, and therefore 7 678 439 is not a square number.
The square of a number (here 7 678 439) is the result of the product of this number (7 678 439) by itself (i.e., 7 678 439 × 7 678 439); the square of 7 678 439 is sometimes called "raising 7 678 439 to the power 2", or "7 678 439 squared".
The square of 7 678 439 is 58 958 425 476 721 because 7 678 439 × 7 678 439 = 7 678 4392 = 58 958 425 476 721.
As a consequence, 7 678 439 is the square root of 58 958 425 476 721.
The multiples of 7 678 439 are all integers evenly divisible by 7 678 439, that is all numbers such that the remainder of the division by 7 678 439 is zero. There are infinitely many multiples of 7 678 439. The smallest multiples of 7 678 439 are: