It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 504 774 is not a prime number.
For example, 6 504 774 can be divided by 2: 6 504 774 / 2 = 3 252 387.
For 6 504 774 to be a prime number, it would have been required that 6 504 774 has only two divisors, i.e., itself and 1.
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6 504 774 is an even number, because it is evenly divisible by 2: 6 504 774 / 2 = 3 252 387.
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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 6 504 774 is about 2 550.446.
Thus, the square root of 6 504 774 is not an integer, and therefore 6 504 774 is not a square number.
The square of a number (here 6 504 774) is the result of the product of this number (6 504 774) by itself (i.e., 6 504 774 × 6 504 774); the square of 6 504 774 is sometimes called "raising 6 504 774 to the power 2", or "6 504 774 squared".
The square of 6 504 774 is 42 312 084 791 076 because 6 504 774 × 6 504 774 = 6 504 7742 = 42 312 084 791 076.
As a consequence, 6 504 774 is the square root of 42 312 084 791 076.
The multiples of 6 504 774 are all integers evenly divisible by 6 504 774, that is all numbers such that the remainder of the division by 6 504 774 is zero. There are infinitely many multiples of 6 504 774. The smallest multiples of 6 504 774 are: