It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 165 842 878 is not a prime number.
For example, 165 842 878 can be divided by 2: 165 842 878 / 2 = 82 921 439.
For 165 842 878 to be a prime number, it would have been required that 165 842 878 has only two divisors, i.e., itself and 1.
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165 842 878 is an even number, because it is evenly divisible by 2: 165 842 878 / 2 = 82 921 439.
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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 165 842 878 is about 12 878.000.
Thus, the square root of 165 842 878 is not an integer, and therefore 165 842 878 is not a square number.
The square of a number (here 165 842 878) is the result of the product of this number (165 842 878) by itself (i.e., 165 842 878 × 165 842 878); the square of 165 842 878 is sometimes called "raising 165 842 878 to the power 2", or "165 842 878 squared".
The square of 165 842 878 is 27 503 860 183 322 884 because 165 842 878 × 165 842 878 = 165 842 8782 = 27 503 860 183 322 884.
As a consequence, 165 842 878 is the square root of 27 503 860 183 322 884.
165 842 878 is a number with 9 digits.
The multiples of 165 842 878 are all integers evenly divisible by 165 842 878, that is all numbers such that the remainder of the division by 165 842 878 is zero. There are infinitely many multiples of 165 842 878. The smallest multiples of 165 842 878 are: