It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 720 431 is not a prime number.
For example, 720 431 can be divided by 107: 720 431 / 107 = 6 733.
For 720 431 to be a prime number, it would have been required that 720 431 has only two divisors, i.e., itself and 1.
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720 431 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 720 431 is about 848.782.
Thus, the square root of 720 431 is not an integer, and therefore 720 431 is not a square number.
The square of a number (here 720 431) is the result of the product of this number (720 431) by itself (i.e., 720 431 × 720 431); the square of 720 431 is sometimes called "raising 720 431 to the power 2", or "720 431 squared".
The square of 720 431 is 519 020 825 761 because 720 431 × 720 431 = 720 4312 = 519 020 825 761.
As a consequence, 720 431 is the square root of 519 020 825 761.
The multiples of 720 431 are all integers evenly divisible by 720 431, that is all numbers such that the remainder of the division by 720 431 is zero. There are infinitely many multiples of 720 431. The smallest multiples of 720 431 are: