It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 165 402 is not a prime number.
For example, 165 402 can be divided by 2: 165 402 / 2 = 82 701.
For 165 402 to be a prime number, it would have been required that 165 402 has only two divisors, i.e., itself and 1.
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165 402 is an even number, because it is evenly divisible by 2: 165 402 / 2 = 82 701.
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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 165 402 is about 406.696.
Thus, the square root of 165 402 is not an integer, and therefore 165 402 is not a square number.
The square of a number (here 165 402) is the result of the product of this number (165 402) by itself (i.e., 165 402 × 165 402); the square of 165 402 is sometimes called "raising 165 402 to the power 2", or "165 402 squared".
The square of 165 402 is 27 357 821 604 because 165 402 × 165 402 = 165 4022 = 27 357 821 604.
As a consequence, 165 402 is the square root of 27 357 821 604.
The multiples of 165 402 are all integers evenly divisible by 165 402, that is all numbers such that the remainder of the division by 165 402 is zero. There are infinitely many multiples of 165 402. The smallest multiples of 165 402 are: