It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 505 649 012 is not a prime number.
For example, 505 649 012 can be divided by 2: 505 649 012 / 2 = 252 824 506.
For 505 649 012 to be a prime number, it would have been required that 505 649 012 has only two divisors, i.e., itself and 1.
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505 649 012 is an even number, because it is evenly divisible by 2: 505 649 012 / 2 = 252 824 506.
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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 505 649 012 is about 22 486.641.
Thus, the square root of 505 649 012 is not an integer, and therefore 505 649 012 is not a square number.
The square of a number (here 505 649 012) is the result of the product of this number (505 649 012) by itself (i.e., 505 649 012 × 505 649 012); the square of 505 649 012 is sometimes called "raising 505 649 012 to the power 2", or "505 649 012 squared".
The square of 505 649 012 is 255 680 923 336 576 128 because 505 649 012 × 505 649 012 = 505 649 0122 = 255 680 923 336 576 128.
As a consequence, 505 649 012 is the square root of 255 680 923 336 576 128.
505 649 012 is a number with 9 digits.
The multiples of 505 649 012 are all integers evenly divisible by 505 649 012, that is all numbers such that the remainder of the division by 505 649 012 is zero. There are infinitely many multiples of 505 649 012. The smallest multiples of 505 649 012 are: