It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 484 is not a prime number.
For example, 644 484 can be divided by 2: 644 484 / 2 = 322 242.
For 644 484 to be a prime number, it would have been required that 644 484 has only two divisors, i.e., itself and 1.
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644 484 is an even number, because it is evenly divisible by 2: 644 484 / 2 = 322 242.
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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 644 484 is about 802.798.
Thus, the square root of 644 484 is not an integer, and therefore 644 484 is not a square number.
The square of a number (here 644 484) is the result of the product of this number (644 484) by itself (i.e., 644 484 × 644 484); the square of 644 484 is sometimes called "raising 644 484 to the power 2", or "644 484 squared".
The square of 644 484 is 415 359 626 256 because 644 484 × 644 484 = 644 4842 = 415 359 626 256.
As a consequence, 644 484 is the square root of 415 359 626 256.
The multiples of 644 484 are all integers evenly divisible by 644 484, that is all numbers such that the remainder of the division by 644 484 is zero. There are infinitely many multiples of 644 484. The smallest multiples of 644 484 are: