It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 797 798 is not a prime number.
For example, 797 798 can be divided by 2: 797 798 / 2 = 398 899.
For 797 798 to be a prime number, it would have been required that 797 798 has only two divisors, i.e., itself and 1.
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797 798 is an even number, because it is evenly divisible by 2: 797 798 / 2 = 398 899.
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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 797 798 is about 893.195.
Thus, the square root of 797 798 is not an integer, and therefore 797 798 is not a square number.
The square of a number (here 797 798) is the result of the product of this number (797 798) by itself (i.e., 797 798 × 797 798); the square of 797 798 is sometimes called "raising 797 798 to the power 2", or "797 798 squared".
The square of 797 798 is 636 481 648 804 because 797 798 × 797 798 = 797 7982 = 636 481 648 804.
As a consequence, 797 798 is the square root of 636 481 648 804.
The multiples of 797 798 are all integers evenly divisible by 797 798, that is all numbers such that the remainder of the division by 797 798 is zero. There are infinitely many multiples of 797 798. The smallest multiples of 797 798 are: