It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 722 721 is not a prime number.
For example, 722 721 can be divided by 3: 722 721 / 3 = 240 907.
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For 722 721 to be a prime number, it would have been required that 722 721 has only two divisors, i.e., itself and 1.
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722 721 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 722 721 is about 850.130.
Thus, the square root of 722 721 is not an integer, and therefore 722 721 is not a square number.
The square of a number (here 722 721) is the result of the product of this number (722 721) by itself (i.e., 722 721 × 722 721); the square of 722 721 is sometimes called "raising 722 721 to the power 2", or "722 721 squared".
The square of 722 721 is 522 325 643 841 because 722 721 × 722 721 = 722 7212 = 522 325 643 841.
As a consequence, 722 721 is the square root of 522 325 643 841.
The multiples of 722 721 are all integers evenly divisible by 722 721, that is all numbers such that the remainder of the division by 722 721 is zero. There are infinitely many multiples of 722 721. The smallest multiples of 722 721 are: