It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 165 742 is not a prime number.
For example, 165 742 can be divided by 2: 165 742 / 2 = 82 871.
For 165 742 to be a prime number, it would have been required that 165 742 has only two divisors, i.e., itself and 1.
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165 742 is an even number, because it is evenly divisible by 2: 165 742 / 2 = 82 871.
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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 165 742 is about 407.114.
Thus, the square root of 165 742 is not an integer, and therefore 165 742 is not a square number.
The square of a number (here 165 742) is the result of the product of this number (165 742) by itself (i.e., 165 742 × 165 742); the square of 165 742 is sometimes called "raising 165 742 to the power 2", or "165 742 squared".
The square of 165 742 is 27 470 410 564 because 165 742 × 165 742 = 165 7422 = 27 470 410 564.
As a consequence, 165 742 is the square root of 27 470 410 564.
The multiples of 165 742 are all integers evenly divisible by 165 742, that is all numbers such that the remainder of the division by 165 742 is zero. There are infinitely many multiples of 165 742. The smallest multiples of 165 742 are: