It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 165 428 is not a prime number.
For example, 165 428 can be divided by 2: 165 428 / 2 = 82 714.
For 165 428 to be a prime number, it would have been required that 165 428 has only two divisors, i.e., itself and 1.
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165 428 is an even number, because it is evenly divisible by 2: 165 428 / 2 = 82 714.
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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 165 428 is about 406.728.
Thus, the square root of 165 428 is not an integer, and therefore 165 428 is not a square number.
The square of a number (here 165 428) is the result of the product of this number (165 428) by itself (i.e., 165 428 × 165 428); the square of 165 428 is sometimes called "raising 165 428 to the power 2", or "165 428 squared".
The square of 165 428 is 27 366 423 184 because 165 428 × 165 428 = 165 4282 = 27 366 423 184.
As a consequence, 165 428 is the square root of 27 366 423 184.
The multiples of 165 428 are all integers evenly divisible by 165 428, that is all numbers such that the remainder of the division by 165 428 is zero. There are infinitely many multiples of 165 428. The smallest multiples of 165 428 are: