It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 731 721 is not a prime number.
For example, 731 721 can be divided by 3: 731 721 / 3 = 243 907.
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For 731 721 to be a prime number, it would have been required that 731 721 has only two divisors, i.e., itself and 1.
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731 721 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 731 721 is about 855.407.
Thus, the square root of 731 721 is not an integer, and therefore 731 721 is not a square number.
The square of a number (here 731 721) is the result of the product of this number (731 721) by itself (i.e., 731 721 × 731 721); the square of 731 721 is sometimes called "raising 731 721 to the power 2", or "731 721 squared".
The square of 731 721 is 535 415 621 841 because 731 721 × 731 721 = 731 7212 = 535 415 621 841.
As a consequence, 731 721 is the square root of 535 415 621 841.
The multiples of 731 721 are all integers evenly divisible by 731 721, that is all numbers such that the remainder of the division by 731 721 is zero. There are infinitely many multiples of 731 721. The smallest multiples of 731 721 are: