It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 166 402 878 is not a prime number.
For example, 166 402 878 can be divided by 2: 166 402 878 / 2 = 83 201 439.
For 166 402 878 to be a prime number, it would have been required that 166 402 878 has only two divisors, i.e., itself and 1.
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166 402 878 is an even number, because it is evenly divisible by 2: 166 402 878 / 2 = 83 201 439.
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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 166 402 878 is about 12 899.724.
Thus, the square root of 166 402 878 is not an integer, and therefore 166 402 878 is not a square number.
The square of a number (here 166 402 878) is the result of the product of this number (166 402 878) by itself (i.e., 166 402 878 × 166 402 878); the square of 166 402 878 is sometimes called "raising 166 402 878 to the power 2", or "166 402 878 squared".
The square of 166 402 878 is 27 689 917 806 682 884 because 166 402 878 × 166 402 878 = 166 402 8782 = 27 689 917 806 682 884.
As a consequence, 166 402 878 is the square root of 27 689 917 806 682 884.
166 402 878 is a number with 9 digits.
The multiples of 166 402 878 are all integers evenly divisible by 166 402 878, that is all numbers such that the remainder of the division by 166 402 878 is zero. There are infinitely many multiples of 166 402 878. The smallest multiples of 166 402 878 are: