It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 644 241 264 is not a prime number.
For example, 644 241 264 can be divided by 2: 644 241 264 / 2 = 322 120 632.
For 644 241 264 to be a prime number, it would have been required that 644 241 264 has only two divisors, i.e., itself and 1.
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644 241 264 is an even number, because it is evenly divisible by 2: 644 241 264 / 2 = 322 120 632.
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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 644 241 264 is about 25 381.908.
Thus, the square root of 644 241 264 is not an integer, and therefore 644 241 264 is not a square number.
The square of a number (here 644 241 264) is the result of the product of this number (644 241 264) by itself (i.e., 644 241 264 × 644 241 264); the square of 644 241 264 is sometimes called "raising 644 241 264 to the power 2", or "644 241 264 squared".
The square of 644 241 264 is 415 046 806 240 317 696 because 644 241 264 × 644 241 264 = 644 241 2642 = 415 046 806 240 317 696.
As a consequence, 644 241 264 is the square root of 415 046 806 240 317 696.
644 241 264 is a number with 9 digits.
The multiples of 644 241 264 are all integers evenly divisible by 644 241 264, that is all numbers such that the remainder of the division by 644 241 264 is zero. There are infinitely many multiples of 644 241 264. The smallest multiples of 644 241 264 are: