It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 720 678 is not a prime number.
For example, 720 678 can be divided by 2: 720 678 / 2 = 360 339.
For 720 678 to be a prime number, it would have been required that 720 678 has only two divisors, i.e., itself and 1.
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720 678 is an even number, because it is evenly divisible by 2: 720 678 / 2 = 360 339.
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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 720 678 is about 848.928.
Thus, the square root of 720 678 is not an integer, and therefore 720 678 is not a square number.
The square of a number (here 720 678) is the result of the product of this number (720 678) by itself (i.e., 720 678 × 720 678); the square of 720 678 is sometimes called "raising 720 678 to the power 2", or "720 678 squared".
The square of 720 678 is 519 376 779 684 because 720 678 × 720 678 = 720 6782 = 519 376 779 684.
As a consequence, 720 678 is the square root of 519 376 779 684.
The multiples of 720 678 are all integers evenly divisible by 720 678, that is all numbers such that the remainder of the division by 720 678 is zero. There are infinitely many multiples of 720 678. The smallest multiples of 720 678 are: