It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 166 402 998 is not a prime number.
For example, 166 402 998 can be divided by 2: 166 402 998 / 2 = 83 201 499.
For 166 402 998 to be a prime number, it would have been required that 166 402 998 has only two divisors, i.e., itself and 1.
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166 402 998 is an even number, because it is evenly divisible by 2: 166 402 998 / 2 = 83 201 499.
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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 166 402 998 is about 12 899.729.
Thus, the square root of 166 402 998 is not an integer, and therefore 166 402 998 is not a square number.
The square of a number (here 166 402 998) is the result of the product of this number (166 402 998) by itself (i.e., 166 402 998 × 166 402 998); the square of 166 402 998 is sometimes called "raising 166 402 998 to the power 2", or "166 402 998 squared".
The square of 166 402 998 is 27 689 957 743 388 004 because 166 402 998 × 166 402 998 = 166 402 9982 = 27 689 957 743 388 004.
As a consequence, 166 402 998 is the square root of 27 689 957 743 388 004.
166 402 998 is a number with 9 digits.
The multiples of 166 402 998 are all integers evenly divisible by 166 402 998, that is all numbers such that the remainder of the division by 166 402 998 is zero. There are infinitely many multiples of 166 402 998. The smallest multiples of 166 402 998 are: