It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 708 721 is not a prime number.
For example, 708 721 can be divided by 13: 708 721 / 13 = 54 517.
For 708 721 to be a prime number, it would have been required that 708 721 has only two divisors, i.e., itself and 1.
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708 721 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 708 721 is about 841.856.
Thus, the square root of 708 721 is not an integer, and therefore 708 721 is not a square number.
The square of a number (here 708 721) is the result of the product of this number (708 721) by itself (i.e., 708 721 × 708 721); the square of 708 721 is sometimes called "raising 708 721 to the power 2", or "708 721 squared".
The square of 708 721 is 502 285 455 841 because 708 721 × 708 721 = 708 7212 = 502 285 455 841.
As a consequence, 708 721 is the square root of 502 285 455 841.
The multiples of 708 721 are all integers evenly divisible by 708 721, that is all numbers such that the remainder of the division by 708 721 is zero. There are infinitely many multiples of 708 721. The smallest multiples of 708 721 are: