It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 997 721 is not a prime number.
For example, 997 721 can be divided by 269: 997 721 / 269 = 3 709.
For 997 721 to be a prime number, it would have been required that 997 721 has only two divisors, i.e., itself and 1.
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997 721 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 997 721 is about 998.860.
Thus, the square root of 997 721 is not an integer, and therefore 997 721 is not a square number.
The square of a number (here 997 721) is the result of the product of this number (997 721) by itself (i.e., 997 721 × 997 721); the square of 997 721 is sometimes called "raising 997 721 to the power 2", or "997 721 squared".
The square of 997 721 is 995 447 193 841 because 997 721 × 997 721 = 997 7212 = 995 447 193 841.
As a consequence, 997 721 is the square root of 995 447 193 841.
The multiples of 997 721 are all integers evenly divisible by 997 721, that is all numbers such that the remainder of the division by 997 721 is zero. There are infinitely many multiples of 997 721. The smallest multiples of 997 721 are: