It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 801 721 is not a prime number.
For example, 801 721 can be divided by 569: 801 721 / 569 = 1 409.
For 801 721 to be a prime number, it would have been required that 801 721 has only two divisors, i.e., itself and 1.
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801 721 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 801 721 is about 895.389.
Thus, the square root of 801 721 is not an integer, and therefore 801 721 is not a square number.
The square of a number (here 801 721) is the result of the product of this number (801 721) by itself (i.e., 801 721 × 801 721); the square of 801 721 is sometimes called "raising 801 721 to the power 2", or "801 721 squared".
The square of 801 721 is 642 756 561 841 because 801 721 × 801 721 = 801 7212 = 642 756 561 841.
As a consequence, 801 721 is the square root of 642 756 561 841.
The multiples of 801 721 are all integers evenly divisible by 801 721, that is all numbers such that the remainder of the division by 801 721 is zero. There are infinitely many multiples of 801 721. The smallest multiples of 801 721 are: