It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 720 216 is not a prime number.
For example, 720 216 can be divided by 2: 720 216 / 2 = 360 108.
For 720 216 to be a prime number, it would have been required that 720 216 has only two divisors, i.e., itself and 1.
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720 216 is an even number, because it is evenly divisible by 2: 720 216 / 2 = 360 108.
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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 720 216 is about 848.655.
Thus, the square root of 720 216 is not an integer, and therefore 720 216 is not a square number.
The square of a number (here 720 216) is the result of the product of this number (720 216) by itself (i.e., 720 216 × 720 216); the square of 720 216 is sometimes called "raising 720 216 to the power 2", or "720 216 squared".
The square of 720 216 is 518 711 086 656 because 720 216 × 720 216 = 720 2162 = 518 711 086 656.
As a consequence, 720 216 is the square root of 518 711 086 656.
The multiples of 720 216 are all integers evenly divisible by 720 216, that is all numbers such that the remainder of the division by 720 216 is zero. There are infinitely many multiples of 720 216. The smallest multiples of 720 216 are: