It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 722 016 is not a prime number.
For example, 722 016 can be divided by 2: 722 016 / 2 = 361 008.
For 722 016 to be a prime number, it would have been required that 722 016 has only two divisors, i.e., itself and 1.
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722 016 is an even number, because it is evenly divisible by 2: 722 016 / 2 = 361 008.
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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 722 016 is about 849.715.
Thus, the square root of 722 016 is not an integer, and therefore 722 016 is not a square number.
The square of a number (here 722 016) is the result of the product of this number (722 016) by itself (i.e., 722 016 × 722 016); the square of 722 016 is sometimes called "raising 722 016 to the power 2", or "722 016 squared".
The square of 722 016 is 521 307 104 256 because 722 016 × 722 016 = 722 0162 = 521 307 104 256.
As a consequence, 722 016 is the square root of 521 307 104 256.
The multiples of 722 016 are all integers evenly divisible by 722 016, that is all numbers such that the remainder of the division by 722 016 is zero. There are infinitely many multiples of 722 016. The smallest multiples of 722 016 are: