It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 997 401 688 is not a prime number.
For example, 997 401 688 can be divided by 2: 997 401 688 / 2 = 498 700 844.
For 997 401 688 to be a prime number, it would have been required that 997 401 688 has only two divisors, i.e., itself and 1.
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997 401 688 is an even number, because it is evenly divisible by 2: 997 401 688 / 2 = 498 700 844.
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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 997 401 688 is about 31 581.667.
Thus, the square root of 997 401 688 is not an integer, and therefore 997 401 688 is not a square number.
The square of a number (here 997 401 688) is the result of the product of this number (997 401 688) by itself (i.e., 997 401 688 × 997 401 688); the square of 997 401 688 is sometimes called "raising 997 401 688 to the power 2", or "997 401 688 squared".
The square of 997 401 688 is 994 810 127 225 249 280 because 997 401 688 × 997 401 688 = 997 401 6882 = 994 810 127 225 249 280.
As a consequence, 997 401 688 is the square root of 994 810 127 225 249 280.
997 401 688 is a number with 9 digits.
The multiples of 997 401 688 are all integers evenly divisible by 997 401 688, that is all numbers such that the remainder of the division by 997 401 688 is zero. There are infinitely many multiples of 997 401 688. The smallest multiples of 997 401 688 are: