It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 720 731 642 is not a prime number.
For example, 720 731 642 can be divided by 2: 720 731 642 / 2 = 360 365 821.
For 720 731 642 to be a prime number, it would have been required that 720 731 642 has only two divisors, i.e., itself and 1.
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720 731 642 is an even number, because it is evenly divisible by 2: 720 731 642 / 2 = 360 365 821.
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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 720 731 642 is about 26 846.446.
Thus, the square root of 720 731 642 is not an integer, and therefore 720 731 642 is not a square number.
The square of a number (here 720 731 642) is the result of the product of this number (720 731 642) by itself (i.e., 720 731 642 × 720 731 642); the square of 720 731 642 is sometimes called "raising 720 731 642 to the power 2", or "720 731 642 squared".
The square of 720 731 642 is 519 454 099 780 016 192 because 720 731 642 × 720 731 642 = 720 731 6422 = 519 454 099 780 016 192.
As a consequence, 720 731 642 is the square root of 519 454 099 780 016 192.
720 731 642 is a number with 9 digits.
The multiples of 720 731 642 are all integers evenly divisible by 720 731 642, that is all numbers such that the remainder of the division by 720 731 642 is zero. There are infinitely many multiples of 720 731 642. The smallest multiples of 720 731 642 are: