It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 721 708 is not a prime number.
For example, 721 708 can be divided by 2: 721 708 / 2 = 360 854.
For 721 708 to be a prime number, it would have been required that 721 708 has only two divisors, i.e., itself and 1.
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721 708 is an even number, because it is evenly divisible by 2: 721 708 / 2 = 360 854.
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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 721 708 is about 849.534.
Thus, the square root of 721 708 is not an integer, and therefore 721 708 is not a square number.
The square of a number (here 721 708) is the result of the product of this number (721 708) by itself (i.e., 721 708 × 721 708); the square of 721 708 is sometimes called "raising 721 708 to the power 2", or "721 708 squared".
The square of 721 708 is 520 862 437 264 because 721 708 × 721 708 = 721 7082 = 520 862 437 264.
As a consequence, 721 708 is the square root of 520 862 437 264.
The multiples of 721 708 are all integers evenly divisible by 721 708, that is all numbers such that the remainder of the division by 721 708 is zero. There are infinitely many multiples of 721 708. The smallest multiples of 721 708 are: