It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 720 691 is not a prime number.
For example, 720 691 can be divided by 103: 720 691 / 103 = 6 997.
For 720 691 to be a prime number, it would have been required that 720 691 has only two divisors, i.e., itself and 1.
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720 691 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 720 691 is about 848.935.
Thus, the square root of 720 691 is not an integer, and therefore 720 691 is not a square number.
The square of a number (here 720 691) is the result of the product of this number (720 691) by itself (i.e., 720 691 × 720 691); the square of 720 691 is sometimes called "raising 720 691 to the power 2", or "720 691 squared".
The square of 720 691 is 519 395 517 481 because 720 691 × 720 691 = 720 6912 = 519 395 517 481.
As a consequence, 720 691 is the square root of 519 395 517 481.
The multiples of 720 691 are all integers evenly divisible by 720 691, that is all numbers such that the remainder of the division by 720 691 is zero. There are infinitely many multiples of 720 691. The smallest multiples of 720 691 are: