It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 726 016 is not a prime number.
For example, 726 016 can be divided by 2: 726 016 / 2 = 363 008.
For 726 016 to be a prime number, it would have been required that 726 016 has only two divisors, i.e., itself and 1.
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726 016 is an even number, because it is evenly divisible by 2: 726 016 / 2 = 363 008.
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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 726 016 is about 852.066.
Thus, the square root of 726 016 is not an integer, and therefore 726 016 is not a square number.
The square of a number (here 726 016) is the result of the product of this number (726 016) by itself (i.e., 726 016 × 726 016); the square of 726 016 is sometimes called "raising 726 016 to the power 2", or "726 016 squared".
The square of 726 016 is 527 099 232 256 because 726 016 × 726 016 = 726 0162 = 527 099 232 256.
As a consequence, 726 016 is the square root of 527 099 232 256.
The multiples of 726 016 are all integers evenly divisible by 726 016, that is all numbers such that the remainder of the division by 726 016 is zero. There are infinitely many multiples of 726 016. The smallest multiples of 726 016 are: