It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 165 376 is not a prime number.
For example, 165 376 can be divided by 2: 165 376 / 2 = 82 688.
For 165 376 to be a prime number, it would have been required that 165 376 has only two divisors, i.e., itself and 1.
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165 376 is an even number, because it is evenly divisible by 2: 165 376 / 2 = 82 688.
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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 165 376 is about 406.664.
Thus, the square root of 165 376 is not an integer, and therefore 165 376 is not a square number.
The square of a number (here 165 376) is the result of the product of this number (165 376) by itself (i.e., 165 376 × 165 376); the square of 165 376 is sometimes called "raising 165 376 to the power 2", or "165 376 squared".
The square of 165 376 is 27 349 221 376 because 165 376 × 165 376 = 165 3762 = 27 349 221 376.
As a consequence, 165 376 is the square root of 27 349 221 376.
The multiples of 165 376 are all integers evenly divisible by 165 376, that is all numbers such that the remainder of the division by 165 376 is zero. There are infinitely many multiples of 165 376. The smallest multiples of 165 376 are: