It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 723 738 is not a prime number.
For example, 723 738 can be divided by 2: 723 738 / 2 = 361 869.
For 723 738 to be a prime number, it would have been required that 723 738 has only two divisors, i.e., itself and 1.
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723 738 is an even number, because it is evenly divisible by 2: 723 738 / 2 = 361 869.
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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 723 738 is about 850.728.
Thus, the square root of 723 738 is not an integer, and therefore 723 738 is not a square number.
The square of a number (here 723 738) is the result of the product of this number (723 738) by itself (i.e., 723 738 × 723 738); the square of 723 738 is sometimes called "raising 723 738 to the power 2", or "723 738 squared".
The square of 723 738 is 523 796 692 644 because 723 738 × 723 738 = 723 7382 = 523 796 692 644.
As a consequence, 723 738 is the square root of 523 796 692 644.
The multiples of 723 738 are all integers evenly divisible by 723 738, that is all numbers such that the remainder of the division by 723 738 is zero. There are infinitely many multiples of 723 738. The smallest multiples of 723 738 are: