It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 7 997 779 is not a prime number.
For example, 7 997 779 can be divided by 2 381: 7 997 779 / 2381 = 3 359.
For 7 997 779 to be a prime number, it would have been required that 7 997 779 has only two divisors, i.e., itself and 1.
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7 997 779 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 7 997 779 is about 2 828.034.
Thus, the square root of 7 997 779 is not an integer, and therefore 7 997 779 is not a square number.
The square of a number (here 7 997 779) is the result of the product of this number (7 997 779) by itself (i.e., 7 997 779 × 7 997 779); the square of 7 997 779 is sometimes called "raising 7 997 779 to the power 2", or "7 997 779 squared".
The square of 7 997 779 is 63 964 468 932 841 because 7 997 779 × 7 997 779 = 7 997 7792 = 63 964 468 932 841.
As a consequence, 7 997 779 is the square root of 63 964 468 932 841.
The multiples of 7 997 779 are all integers evenly divisible by 7 997 779, that is all numbers such that the remainder of the division by 7 997 779 is zero. There are infinitely many multiples of 7 997 779. The smallest multiples of 7 997 779 are: