It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 165 824 is not a prime number.
For example, 165 824 can be divided by 2: 165 824 / 2 = 82 912.
For 165 824 to be a prime number, it would have been required that 165 824 has only two divisors, i.e., itself and 1.
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165 824 is an even number, because it is evenly divisible by 2: 165 824 / 2 = 82 912.
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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 165 824 is about 407.215.
Thus, the square root of 165 824 is not an integer, and therefore 165 824 is not a square number.
The square of a number (here 165 824) is the result of the product of this number (165 824) by itself (i.e., 165 824 × 165 824); the square of 165 824 is sometimes called "raising 165 824 to the power 2", or "165 824 squared".
The square of 165 824 is 27 497 598 976 because 165 824 × 165 824 = 165 8242 = 27 497 598 976.
As a consequence, 165 824 is the square root of 27 497 598 976.
The multiples of 165 824 are all integers evenly divisible by 165 824, that is all numbers such that the remainder of the division by 165 824 is zero. There are infinitely many multiples of 165 824. The smallest multiples of 165 824 are: