It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 874 009 is not a prime number.
For example, 6 874 009 can be divided by 1 237: 6 874 009 / 1237 = 5 557.
For 6 874 009 to be a prime number, it would have been required that 6 874 009 has only two divisors, i.e., itself and 1.
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6 874 009 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 6 874 009 is about 2 621.833.
Thus, the square root of 6 874 009 is not an integer, and therefore 6 874 009 is not a square number.
The square of a number (here 6 874 009) is the result of the product of this number (6 874 009) by itself (i.e., 6 874 009 × 6 874 009); the square of 6 874 009 is sometimes called "raising 6 874 009 to the power 2", or "6 874 009 squared".
The square of 6 874 009 is 47 251 999 732 081 because 6 874 009 × 6 874 009 = 6 874 0092 = 47 251 999 732 081.
As a consequence, 6 874 009 is the square root of 47 251 999 732 081.
The multiples of 6 874 009 are all integers evenly divisible by 6 874 009, that is all numbers such that the remainder of the division by 6 874 009 is zero. There are infinitely many multiples of 6 874 009. The smallest multiples of 6 874 009 are: