It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 7 998 121 is not a prime number.
For example, 7 998 121 can be divided by 1 091: 7 998 121 / 1091 = 7 331.
For 7 998 121 to be a prime number, it would have been required that 7 998 121 has only two divisors, i.e., itself and 1.
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7 998 121 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 7 998 121 is about 2 828.095.
Thus, the square root of 7 998 121 is not an integer, and therefore 7 998 121 is not a square number.
The square of a number (here 7 998 121) is the result of the product of this number (7 998 121) by itself (i.e., 7 998 121 × 7 998 121); the square of 7 998 121 is sometimes called "raising 7 998 121 to the power 2", or "7 998 121 squared".
The square of 7 998 121 is 63 969 939 530 641 because 7 998 121 × 7 998 121 = 7 998 1212 = 63 969 939 530 641.
As a consequence, 7 998 121 is the square root of 63 969 939 530 641.
The multiples of 7 998 121 are all integers evenly divisible by 7 998 121, that is all numbers such that the remainder of the division by 7 998 121 is zero. There are infinitely many multiples of 7 998 121. The smallest multiples of 7 998 121 are: