It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 797 797 is not a prime number.
For example, 797 797 can be divided by 7: 797 797 / 7 = 113 971.
For 797 797 to be a prime number, it would have been required that 797 797 has only two divisors, i.e., itself and 1.
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797 797 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 797 797 is about 893.195.
Thus, the square root of 797 797 is not an integer, and therefore 797 797 is not a square number.
The square of a number (here 797 797) is the result of the product of this number (797 797) by itself (i.e., 797 797 × 797 797); the square of 797 797 is sometimes called "raising 797 797 to the power 2", or "797 797 squared".
The square of 797 797 is 636 480 053 209 because 797 797 × 797 797 = 797 7972 = 636 480 053 209.
As a consequence, 797 797 is the square root of 636 480 053 209.
The multiples of 797 797 are all integers evenly divisible by 797 797, that is all numbers such that the remainder of the division by 797 797 is zero. There are infinitely many multiples of 797 797. The smallest multiples of 797 797 are: