It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 166 642 is not a prime number.
For example, 166 642 can be divided by 2: 166 642 / 2 = 83 321.
For 166 642 to be a prime number, it would have been required that 166 642 has only two divisors, i.e., itself and 1.
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166 642 is an even number, because it is evenly divisible by 2: 166 642 / 2 = 83 321.
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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 166 642 is about 408.218.
Thus, the square root of 166 642 is not an integer, and therefore 166 642 is not a square number.
The square of a number (here 166 642) is the result of the product of this number (166 642) by itself (i.e., 166 642 × 166 642); the square of 166 642 is sometimes called "raising 166 642 to the power 2", or "166 642 squared".
The square of 166 642 is 27 769 556 164 because 166 642 × 166 642 = 166 6422 = 27 769 556 164.
As a consequence, 166 642 is the square root of 27 769 556 164.
The multiples of 166 642 are all integers evenly divisible by 166 642, that is all numbers such that the remainder of the division by 166 642 is zero. There are infinitely many multiples of 166 642. The smallest multiples of 166 642 are: