It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 708 816 is not a prime number.
For example, 708 816 can be divided by 2: 708 816 / 2 = 354 408.
For 708 816 to be a prime number, it would have been required that 708 816 has only two divisors, i.e., itself and 1.
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708 816 is an even number, because it is evenly divisible by 2: 708 816 / 2 = 354 408.
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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 708 816 is about 841.912.
Thus, the square root of 708 816 is not an integer, and therefore 708 816 is not a square number.
The square of a number (here 708 816) is the result of the product of this number (708 816) by itself (i.e., 708 816 × 708 816); the square of 708 816 is sometimes called "raising 708 816 to the power 2", or "708 816 squared".
The square of 708 816 is 502 420 121 856 because 708 816 × 708 816 = 708 8162 = 502 420 121 856.
As a consequence, 708 816 is the square root of 502 420 121 856.
The multiples of 708 816 are all integers evenly divisible by 708 816, that is all numbers such that the remainder of the division by 708 816 is zero. There are infinitely many multiples of 708 816. The smallest multiples of 708 816 are: