It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 165 191 is not a prime number.
For example, 165 191 can be divided by 13: 165 191 / 13 = 12 707.
For 165 191 to be a prime number, it would have been required that 165 191 has only two divisors, i.e., itself and 1.
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165 191 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 165 191 is about 406.437.
Thus, the square root of 165 191 is not an integer, and therefore 165 191 is not a square number.
The square of a number (here 165 191) is the result of the product of this number (165 191) by itself (i.e., 165 191 × 165 191); the square of 165 191 is sometimes called "raising 165 191 to the power 2", or "165 191 squared".
The square of 165 191 is 27 288 066 481 because 165 191 × 165 191 = 165 1912 = 27 288 066 481.
As a consequence, 165 191 is the square root of 27 288 066 481.
The multiples of 165 191 are all integers evenly divisible by 165 191, that is all numbers such that the remainder of the division by 165 191 is zero. There are infinitely many multiples of 165 191. The smallest multiples of 165 191 are: