It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 300 789 644 is not a prime number.
For example, 300 789 644 can be divided by 2: 300 789 644 / 2 = 150 394 822.
For 300 789 644 to be a prime number, it would have been required that 300 789 644 has only two divisors, i.e., itself and 1.
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300 789 644 is an even number, because it is evenly divisible by 2: 300 789 644 / 2 = 150 394 822.
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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 300 789 644 is about 17 343.288.
Thus, the square root of 300 789 644 is not an integer, and therefore 300 789 644 is not a square number.
The square of a number (here 300 789 644) is the result of the product of this number (300 789 644) by itself (i.e., 300 789 644 × 300 789 644); the square of 300 789 644 is sometimes called "raising 300 789 644 to the power 2", or "300 789 644 squared".
The square of 300 789 644 is 90 474 409 937 646 736 because 300 789 644 × 300 789 644 = 300 789 6442 = 90 474 409 937 646 736.
As a consequence, 300 789 644 is the square root of 90 474 409 937 646 736.
300 789 644 is a number with 9 digits.
The multiples of 300 789 644 are all integers evenly divisible by 300 789 644, that is all numbers such that the remainder of the division by 300 789 644 is zero. There are infinitely many multiples of 300 789 644. The smallest multiples of 300 789 644 are: