It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 2 642 743 is not a prime number.
For example, 2 642 743 can be divided by 127: 2 642 743 / 127 = 20 809.
For 2 642 743 to be a prime number, it would have been required that 2 642 743 has only two divisors, i.e., itself and 1.
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2 642 743 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 2 642 743 is about 1 625.652.
Thus, the square root of 2 642 743 is not an integer, and therefore 2 642 743 is not a square number.
The square of a number (here 2 642 743) is the result of the product of this number (2 642 743) by itself (i.e., 2 642 743 × 2 642 743); the square of 2 642 743 is sometimes called "raising 2 642 743 to the power 2", or "2 642 743 squared".
The square of 2 642 743 is 6 984 090 564 049 because 2 642 743 × 2 642 743 = 2 642 7432 = 6 984 090 564 049.
As a consequence, 2 642 743 is the square root of 6 984 090 564 049.
The multiples of 2 642 743 are all integers evenly divisible by 2 642 743, that is all numbers such that the remainder of the division by 2 642 743 is zero. There are infinitely many multiples of 2 642 743. The smallest multiples of 2 642 743 are: