It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 3 999 991 is not a prime number.
For example, 3 999 991 can be divided by 1 997: 3 999 991 / 1997 = 2 003.
For 3 999 991 to be a prime number, it would have been required that 3 999 991 has only two divisors, i.e., itself and 1.
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3 999 991 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 3 999 991 is about 1 999.998.
Thus, the square root of 3 999 991 is not an integer, and therefore 3 999 991 is not a square number.
The square of a number (here 3 999 991) is the result of the product of this number (3 999 991) by itself (i.e., 3 999 991 × 3 999 991); the square of 3 999 991 is sometimes called "raising 3 999 991 to the power 2", or "3 999 991 squared".
The square of 3 999 991 is 15 999 928 000 081 because 3 999 991 × 3 999 991 = 3 999 9912 = 15 999 928 000 081.
As a consequence, 3 999 991 is the square root of 15 999 928 000 081.
The multiples of 3 999 991 are all integers evenly divisible by 3 999 991, that is all numbers such that the remainder of the division by 3 999 991 is zero. There are infinitely many multiples of 3 999 991. The smallest multiples of 3 999 991 are: