It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 2 648 309 is not a prime number.
For example, 2 648 309 can be divided by 29: 2 648 309 / 29 = 91 321.
For 2 648 309 to be a prime number, it would have been required that 2 648 309 has only two divisors, i.e., itself and 1.
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2 648 309 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 2 648 309 is about 1 627.363.
Thus, the square root of 2 648 309 is not an integer, and therefore 2 648 309 is not a square number.
The square of a number (here 2 648 309) is the result of the product of this number (2 648 309) by itself (i.e., 2 648 309 × 2 648 309); the square of 2 648 309 is sometimes called "raising 2 648 309 to the power 2", or "2 648 309 squared".
The square of 2 648 309 is 7 013 540 559 481 because 2 648 309 × 2 648 309 = 2 648 3092 = 7 013 540 559 481.
As a consequence, 2 648 309 is the square root of 7 013 540 559 481.
The multiples of 2 648 309 are all integers evenly divisible by 2 648 309, that is all numbers such that the remainder of the division by 2 648 309 is zero. There are infinitely many multiples of 2 648 309. The smallest multiples of 2 648 309 are: