It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 720 684 is not a prime number.
For example, 720 684 can be divided by 2: 720 684 / 2 = 360 342.
For 720 684 to be a prime number, it would have been required that 720 684 has only two divisors, i.e., itself and 1.
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720 684 is an even number, because it is evenly divisible by 2: 720 684 / 2 = 360 342.
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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 720 684 is about 848.931.
Thus, the square root of 720 684 is not an integer, and therefore 720 684 is not a square number.
The square of a number (here 720 684) is the result of the product of this number (720 684) by itself (i.e., 720 684 × 720 684); the square of 720 684 is sometimes called "raising 720 684 to the power 2", or "720 684 squared".
The square of 720 684 is 519 385 427 856 because 720 684 × 720 684 = 720 6842 = 519 385 427 856.
As a consequence, 720 684 is the square root of 519 385 427 856.
The multiples of 720 684 are all integers evenly divisible by 720 684, that is all numbers such that the remainder of the division by 720 684 is zero. There are infinitely many multiples of 720 684. The smallest multiples of 720 684 are: