It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 2 644 641 is not a prime number.
For example, 2 644 641 can be divided by 3: 2 644 641 / 3 = 881 547.
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For 2 644 641 to be a prime number, it would have been required that 2 644 641 has only two divisors, i.e., itself and 1.
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2 644 641 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 2 644 641 is about 1 626.235.
Thus, the square root of 2 644 641 is not an integer, and therefore 2 644 641 is not a square number.
The square of a number (here 2 644 641) is the result of the product of this number (2 644 641) by itself (i.e., 2 644 641 × 2 644 641); the square of 2 644 641 is sometimes called "raising 2 644 641 to the power 2", or "2 644 641 squared".
The square of 2 644 641 is 6 994 126 018 881 because 2 644 641 × 2 644 641 = 2 644 6412 = 6 994 126 018 881.
As a consequence, 2 644 641 is the square root of 6 994 126 018 881.
The multiples of 2 644 641 are all integers evenly divisible by 2 644 641, that is all numbers such that the remainder of the division by 2 644 641 is zero. There are infinitely many multiples of 2 644 641. The smallest multiples of 2 644 641 are: