It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 166 501 009 is not a prime number.
For example, 166 501 009 can be divided by 17: 166 501 009 / 17 = 9 794 177.
For 166 501 009 to be a prime number, it would have been required that 166 501 009 has only two divisors, i.e., itself and 1.
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166 501 009 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 166 501 009 is about 12 903.527.
Thus, the square root of 166 501 009 is not an integer, and therefore 166 501 009 is not a square number.
The square of a number (here 166 501 009) is the result of the product of this number (166 501 009) by itself (i.e., 166 501 009 × 166 501 009); the square of 166 501 009 is sometimes called "raising 166 501 009 to the power 2", or "166 501 009 squared".
The square of 166 501 009 is 27 722 585 998 018 080 because 166 501 009 × 166 501 009 = 166 501 0092 = 27 722 585 998 018 080.
As a consequence, 166 501 009 is the square root of 27 722 585 998 018 080.
166 501 009 is a number with 9 digits.
The multiples of 166 501 009 are all integers evenly divisible by 166 501 009, that is all numbers such that the remainder of the division by 166 501 009 is zero. There are infinitely many multiples of 166 501 009. The smallest multiples of 166 501 009 are: