It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 721 242 671 is not a prime number.
For example, 721 242 671 can be divided by 23: 721 242 671 / 23 = 31 358 377.
For 721 242 671 to be a prime number, it would have been required that 721 242 671 has only two divisors, i.e., itself and 1.
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721 242 671 is an odd number, because it is not evenly divisible by 2.
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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 721 242 671 is about 26 855.962.
Thus, the square root of 721 242 671 is not an integer, and therefore 721 242 671 is not a square number.
The square of a number (here 721 242 671) is the result of the product of this number (721 242 671) by itself (i.e., 721 242 671 × 721 242 671); the square of 721 242 671 is sometimes called "raising 721 242 671 to the power 2", or "721 242 671 squared".
The square of 721 242 671 is 520 190 990 471 214 272 because 721 242 671 × 721 242 671 = 721 242 6712 = 520 190 990 471 214 272.
As a consequence, 721 242 671 is the square root of 520 190 990 471 214 272.
721 242 671 is a number with 9 digits.
The multiples of 721 242 671 are all integers evenly divisible by 721 242 671, that is all numbers such that the remainder of the division by 721 242 671 is zero. There are infinitely many multiples of 721 242 671. The smallest multiples of 721 242 671 are: