It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 397 161 is not a prime number.
For example, 397 161 can be divided by 3: 397 161 / 3 = 132 387.
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For 397 161 to be a prime number, it would have been required that 397 161 has only two divisors, i.e., itself and 1.
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397 161 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 397 161 is about 630.207.
Thus, the square root of 397 161 is not an integer, and therefore 397 161 is not a square number.
The square of a number (here 397 161) is the result of the product of this number (397 161) by itself (i.e., 397 161 × 397 161); the square of 397 161 is sometimes called "raising 397 161 to the power 2", or "397 161 squared".
The square of 397 161 is 157 736 859 921 because 397 161 × 397 161 = 397 1612 = 157 736 859 921.
As a consequence, 397 161 is the square root of 157 736 859 921.
The multiples of 397 161 are all integers evenly divisible by 397 161, that is all numbers such that the remainder of the division by 397 161 is zero. There are infinitely many multiples of 397 161. The smallest multiples of 397 161 are: