It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 644 259 is not a prime number.
For example, 1 644 259 can be divided by 743: 1 644 259 / 743 = 2 213.
For 1 644 259 to be a prime number, it would have been required that 1 644 259 has only two divisors, i.e., itself and 1.
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1 644 259 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 1 644 259 is about 1 282.287.
Thus, the square root of 1 644 259 is not an integer, and therefore 1 644 259 is not a square number.
The square of a number (here 1 644 259) is the result of the product of this number (1 644 259) by itself (i.e., 1 644 259 × 1 644 259); the square of 1 644 259 is sometimes called "raising 1 644 259 to the power 2", or "1 644 259 squared".
The square of 1 644 259 is 2 703 587 659 081 because 1 644 259 × 1 644 259 = 1 644 2592 = 2 703 587 659 081.
As a consequence, 1 644 259 is the square root of 2 703 587 659 081.
The multiples of 1 644 259 are all integers evenly divisible by 1 644 259, that is all numbers such that the remainder of the division by 1 644 259 is zero. There are infinitely many multiples of 1 644 259. The smallest multiples of 1 644 259 are: