It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 721 435 016 is not a prime number.
For example, 721 435 016 can be divided by 2: 721 435 016 / 2 = 360 717 508.
For 721 435 016 to be a prime number, it would have been required that 721 435 016 has only two divisors, i.e., itself and 1.
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721 435 016 is an even number, because it is evenly divisible by 2: 721 435 016 / 2 = 360 717 508.
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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 721 435 016 is about 26 859.542.
Thus, the square root of 721 435 016 is not an integer, and therefore 721 435 016 is not a square number.
The square of a number (here 721 435 016) is the result of the product of this number (721 435 016) by itself (i.e., 721 435 016 × 721 435 016); the square of 721 435 016 is sometimes called "raising 721 435 016 to the power 2", or "721 435 016 squared".
The square of 721 435 016 is 520 468 482 310 920 256 because 721 435 016 × 721 435 016 = 721 435 0162 = 520 468 482 310 920 256.
As a consequence, 721 435 016 is the square root of 520 468 482 310 920 256.
721 435 016 is a number with 9 digits.
The multiples of 721 435 016 are all integers evenly divisible by 721 435 016, that is all numbers such that the remainder of the division by 721 435 016 is zero. There are infinitely many multiples of 721 435 016. The smallest multiples of 721 435 016 are: