It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 509 642 is not a prime number.
For example, 6 509 642 can be divided by 2: 6 509 642 / 2 = 3 254 821.
For 6 509 642 to be a prime number, it would have been required that 6 509 642 has only two divisors, i.e., itself and 1.
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6 509 642 is an even number, because it is evenly divisible by 2: 6 509 642 / 2 = 3 254 821.
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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 6 509 642 is about 2 551.400.
Thus, the square root of 6 509 642 is not an integer, and therefore 6 509 642 is not a square number.
The square of a number (here 6 509 642) is the result of the product of this number (6 509 642) by itself (i.e., 6 509 642 × 6 509 642); the square of 6 509 642 is sometimes called "raising 6 509 642 to the power 2", or "6 509 642 squared".
The square of 6 509 642 is 42 375 438 968 164 because 6 509 642 × 6 509 642 = 6 509 6422 = 42 375 438 968 164.
As a consequence, 6 509 642 is the square root of 42 375 438 968 164.
The multiples of 6 509 642 are all integers evenly divisible by 6 509 642, that is all numbers such that the remainder of the division by 6 509 642 is zero. There are infinitely many multiples of 6 509 642. The smallest multiples of 6 509 642 are: