It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 166 413 is not a prime number.
For example, 166 413 can be divided by 3: 166 413 / 3 = 55 471.
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For 166 413 to be a prime number, it would have been required that 166 413 has only two divisors, i.e., itself and 1.
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166 413 is an odd number, because it is not evenly divisible by 2.
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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 166 413 is about 407.937.
Thus, the square root of 166 413 is not an integer, and therefore 166 413 is not a square number.
The square of a number (here 166 413) is the result of the product of this number (166 413) by itself (i.e., 166 413 × 166 413); the square of 166 413 is sometimes called "raising 166 413 to the power 2", or "166 413 squared".
The square of 166 413 is 27 693 286 569 because 166 413 × 166 413 = 166 4132 = 27 693 286 569.
As a consequence, 166 413 is the square root of 27 693 286 569.
The multiples of 166 413 are all integers evenly divisible by 166 413, that is all numbers such that the remainder of the division by 166 413 is zero. There are infinitely many multiples of 166 413. The smallest multiples of 166 413 are: