It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 644 239 is not a prime number.
For example, 6 644 239 can be divided by 7: 6 644 239 / 7 = 949 177.
For 6 644 239 to be a prime number, it would have been required that 6 644 239 has only two divisors, i.e., itself and 1.
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6 644 239 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 6 644 239 is about 2 577.642.
Thus, the square root of 6 644 239 is not an integer, and therefore 6 644 239 is not a square number.
The square of a number (here 6 644 239) is the result of the product of this number (6 644 239) by itself (i.e., 6 644 239 × 6 644 239); the square of 6 644 239 is sometimes called "raising 6 644 239 to the power 2", or "6 644 239 squared".
The square of 6 644 239 is 44 145 911 889 121 because 6 644 239 × 6 644 239 = 6 644 2392 = 44 145 911 889 121.
As a consequence, 6 644 239 is the square root of 44 145 911 889 121.
The multiples of 6 644 239 are all integers evenly divisible by 6 644 239, that is all numbers such that the remainder of the division by 6 644 239 is zero. There are infinitely many multiples of 6 644 239. The smallest multiples of 6 644 239 are: