It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 7 977 386 is not a prime number.
For example, 7 977 386 can be divided by 2: 7 977 386 / 2 = 3 988 693.
For 7 977 386 to be a prime number, it would have been required that 7 977 386 has only two divisors, i.e., itself and 1.
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7 977 386 is an even number, because it is evenly divisible by 2: 7 977 386 / 2 = 3 988 693.
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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 7 977 386 is about 2 824.427.
Thus, the square root of 7 977 386 is not an integer, and therefore 7 977 386 is not a square number.
The square of a number (here 7 977 386) is the result of the product of this number (7 977 386) by itself (i.e., 7 977 386 × 7 977 386); the square of 7 977 386 is sometimes called "raising 7 977 386 to the power 2", or "7 977 386 squared".
The square of 7 977 386 is 63 638 687 392 996 because 7 977 386 × 7 977 386 = 7 977 3862 = 63 638 687 392 996.
As a consequence, 7 977 386 is the square root of 63 638 687 392 996.
The multiples of 7 977 386 are all integers evenly divisible by 7 977 386, that is all numbers such that the remainder of the division by 7 977 386 is zero. There are infinitely many multiples of 7 977 386. The smallest multiples of 7 977 386 are: