It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 989 989 is not a prime number.
For example, 6 989 989 can be divided by 107: 6 989 989 / 107 = 65 327.
For 6 989 989 to be a prime number, it would have been required that 6 989 989 has only two divisors, i.e., itself and 1.
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6 989 989 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 6 989 989 is about 2 643.859.
Thus, the square root of 6 989 989 is not an integer, and therefore 6 989 989 is not a square number.
The square of a number (here 6 989 989) is the result of the product of this number (6 989 989) by itself (i.e., 6 989 989 × 6 989 989); the square of 6 989 989 is sometimes called "raising 6 989 989 to the power 2", or "6 989 989 squared".
The square of 6 989 989 is 48 859 946 220 121 because 6 989 989 × 6 989 989 = 6 989 9892 = 48 859 946 220 121.
As a consequence, 6 989 989 is the square root of 48 859 946 220 121.
The multiples of 6 989 989 are all integers evenly divisible by 6 989 989, that is all numbers such that the remainder of the division by 6 989 989 is zero. There are infinitely many multiples of 6 989 989. The smallest multiples of 6 989 989 are: