It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 7 998 526 is not a prime number.
For example, 7 998 526 can be divided by 2: 7 998 526 / 2 = 3 999 263.
For 7 998 526 to be a prime number, it would have been required that 7 998 526 has only two divisors, i.e., itself and 1.
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7 998 526 is an even number, because it is evenly divisible by 2: 7 998 526 / 2 = 3 999 263.
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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 7 998 526 is about 2 828.167.
Thus, the square root of 7 998 526 is not an integer, and therefore 7 998 526 is not a square number.
The square of a number (here 7 998 526) is the result of the product of this number (7 998 526) by itself (i.e., 7 998 526 × 7 998 526); the square of 7 998 526 is sometimes called "raising 7 998 526 to the power 2", or "7 998 526 squared".
The square of 7 998 526 is 63 976 418 172 676 because 7 998 526 × 7 998 526 = 7 998 5262 = 63 976 418 172 676.
As a consequence, 7 998 526 is the square root of 63 976 418 172 676.
The multiples of 7 998 526 are all integers evenly divisible by 7 998 526, that is all numbers such that the remainder of the division by 7 998 526 is zero. There are infinitely many multiples of 7 998 526. The smallest multiples of 7 998 526 are: