It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 720 671 is not a prime number.
For example, 720 671 can be divided by 7: 720 671 / 7 = 102 953.
For 720 671 to be a prime number, it would have been required that 720 671 has only two divisors, i.e., itself and 1.
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720 671 is an odd number, because it is not evenly divisible by 2.
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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 720 671 is about 848.923.
Thus, the square root of 720 671 is not an integer, and therefore 720 671 is not a square number.
The square of a number (here 720 671) is the result of the product of this number (720 671) by itself (i.e., 720 671 × 720 671); the square of 720 671 is sometimes called "raising 720 671 to the power 2", or "720 671 squared".
The square of 720 671 is 519 366 690 241 because 720 671 × 720 671 = 720 6712 = 519 366 690 241.
As a consequence, 720 671 is the square root of 519 366 690 241.
The multiples of 720 671 are all integers evenly divisible by 720 671, that is all numbers such that the remainder of the division by 720 671 is zero. There are infinitely many multiples of 720 671. The smallest multiples of 720 671 are: