It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 3 988 009 is not a prime number.
For example, 3 988 009 can be divided by 1 997: 3 988 009 / 1997 = 1 997.
For 3 988 009 to be a prime number, it would have been required that 3 988 009 has only two divisors, i.e., itself and 1.
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3 988 009 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 3 988 009 is 1 997.
Therefore, the square root of 3 988 009 is an integer, and as a consequence 3 988 009 is a perfect square.
The square of a number (here 3 988 009) is the result of the product of this number (3 988 009) by itself (i.e., 3 988 009 × 3 988 009); the square of 3 988 009 is sometimes called "raising 3 988 009 to the power 2", or "3 988 009 squared".
The square of 3 988 009 is 15 904 215 784 081 because 3 988 009 × 3 988 009 = 3 988 0092 = 15 904 215 784 081.
As a consequence, 3 988 009 is the square root of 15 904 215 784 081.
The multiples of 3 988 009 are all integers evenly divisible by 3 988 009, that is all numbers such that the remainder of the division by 3 988 009 is zero. There are infinitely many multiples of 3 988 009. The smallest multiples of 3 988 009 are: