It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 689 987 is not a prime number.
For example, 6 689 987 can be divided by 23: 6 689 987 / 23 = 290 869.
For 6 689 987 to be a prime number, it would have been required that 6 689 987 has only two divisors, i.e., itself and 1.
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6 689 987 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 6 689 987 is about 2 586.501.
Thus, the square root of 6 689 987 is not an integer, and therefore 6 689 987 is not a square number.
The square of a number (here 6 689 987) is the result of the product of this number (6 689 987) by itself (i.e., 6 689 987 × 6 689 987); the square of 6 689 987 is sometimes called "raising 6 689 987 to the power 2", or "6 689 987 squared".
The square of 6 689 987 is 44 755 926 060 169 because 6 689 987 × 6 689 987 = 6 689 9872 = 44 755 926 060 169.
As a consequence, 6 689 987 is the square root of 44 755 926 060 169.
The multiples of 6 689 987 are all integers evenly divisible by 6 689 987, that is all numbers such that the remainder of the division by 6 689 987 is zero. There are infinitely many multiples of 6 689 987. The smallest multiples of 6 689 987 are: