It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 720 231 is not a prime number.
For example, 720 231 can be divided by 3: 720 231 / 3 = 240 077.
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For 720 231 to be a prime number, it would have been required that 720 231 has only two divisors, i.e., itself and 1.
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720 231 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 720 231 is about 848.664.
Thus, the square root of 720 231 is not an integer, and therefore 720 231 is not a square number.
The square of a number (here 720 231) is the result of the product of this number (720 231) by itself (i.e., 720 231 × 720 231); the square of 720 231 is sometimes called "raising 720 231 to the power 2", or "720 231 squared".
The square of 720 231 is 518 732 693 361 because 720 231 × 720 231 = 720 2312 = 518 732 693 361.
As a consequence, 720 231 is the square root of 518 732 693 361.
The multiples of 720 231 are all integers evenly divisible by 720 231, that is all numbers such that the remainder of the division by 720 231 is zero. There are infinitely many multiples of 720 231. The smallest multiples of 720 231 are: