It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 397 991 is not a prime number.
For example, 397 991 can be divided by 11: 397 991 / 11 = 36 181.
For 397 991 to be a prime number, it would have been required that 397 991 has only two divisors, i.e., itself and 1.
Find out more:
397 991 is an odd number, because it is not evenly divisible by 2.
Find out more:
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 397 991 is about 630.865.
Thus, the square root of 397 991 is not an integer, and therefore 397 991 is not a square number.
The square of a number (here 397 991) is the result of the product of this number (397 991) by itself (i.e., 397 991 × 397 991); the square of 397 991 is sometimes called "raising 397 991 to the power 2", or "397 991 squared".
The square of 397 991 is 158 396 836 081 because 397 991 × 397 991 = 397 9912 = 158 396 836 081.
As a consequence, 397 991 is the square root of 158 396 836 081.
The multiples of 397 991 are all integers evenly divisible by 397 991, that is all numbers such that the remainder of the division by 397 991 is zero. There are infinitely many multiples of 397 991. The smallest multiples of 397 991 are: