It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 800 300 644 is not a prime number.
For example, 800 300 644 can be divided by 2: 800 300 644 / 2 = 400 150 322.
For 800 300 644 to be a prime number, it would have been required that 800 300 644 has only two divisors, i.e., itself and 1.
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800 300 644 is an even number, because it is evenly divisible by 2: 800 300 644 / 2 = 400 150 322.
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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 800 300 644 is about 28 289.585.
Thus, the square root of 800 300 644 is not an integer, and therefore 800 300 644 is not a square number.
The square of a number (here 800 300 644) is the result of the product of this number (800 300 644) by itself (i.e., 800 300 644 × 800 300 644); the square of 800 300 644 is sometimes called "raising 800 300 644 to the power 2", or "800 300 644 squared".
The square of 800 300 644 is 640 481 120 786 814 720 because 800 300 644 × 800 300 644 = 800 300 6442 = 640 481 120 786 814 720.
As a consequence, 800 300 644 is the square root of 640 481 120 786 814 720.
800 300 644 is a number with 9 digits.
The multiples of 800 300 644 are all integers evenly divisible by 800 300 644, that is all numbers such that the remainder of the division by 800 300 644 is zero. There are infinitely many multiples of 800 300 644. The smallest multiples of 800 300 644 are: