It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 720 689 is not a prime number.
For example, 720 689 can be divided by 19: 720 689 / 19 = 37 931.
For 720 689 to be a prime number, it would have been required that 720 689 has only two divisors, i.e., itself and 1.
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720 689 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 720 689 is about 848.934.
Thus, the square root of 720 689 is not an integer, and therefore 720 689 is not a square number.
The square of a number (here 720 689) is the result of the product of this number (720 689) by itself (i.e., 720 689 × 720 689); the square of 720 689 is sometimes called "raising 720 689 to the power 2", or "720 689 squared".
The square of 720 689 is 519 392 634 721 because 720 689 × 720 689 = 720 6892 = 519 392 634 721.
As a consequence, 720 689 is the square root of 519 392 634 721.
The multiples of 720 689 are all integers evenly divisible by 720 689, that is all numbers such that the remainder of the division by 720 689 is zero. There are infinitely many multiples of 720 689. The smallest multiples of 720 689 are: