It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 721 316 is not a prime number.
For example, 721 316 can be divided by 2: 721 316 / 2 = 360 658.
For 721 316 to be a prime number, it would have been required that 721 316 has only two divisors, i.e., itself and 1.
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721 316 is an even number, because it is evenly divisible by 2: 721 316 / 2 = 360 658.
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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 721 316 is about 849.303.
Thus, the square root of 721 316 is not an integer, and therefore 721 316 is not a square number.
The square of a number (here 721 316) is the result of the product of this number (721 316) by itself (i.e., 721 316 × 721 316); the square of 721 316 is sometimes called "raising 721 316 to the power 2", or "721 316 squared".
The square of 721 316 is 520 296 771 856 because 721 316 × 721 316 = 721 3162 = 520 296 771 856.
As a consequence, 721 316 is the square root of 520 296 771 856.
The multiples of 721 316 are all integers evenly divisible by 721 316, that is all numbers such that the remainder of the division by 721 316 is zero. There are infinitely many multiples of 721 316. The smallest multiples of 721 316 are: