It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 164 121 721 is not a prime number.
For example, 164 121 721 can be divided by 23: 164 121 721 / 23 = 7 135 727.
For 164 121 721 to be a prime number, it would have been required that 164 121 721 has only two divisors, i.e., itself and 1.
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164 121 721 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 164 121 721 is 12 811.
Therefore, the square root of 164 121 721 is an integer, and as a consequence 164 121 721 is a perfect square.
As a consequence, 12 811 is the square root of 164 121 721.
The square of a number (here 164 121 721) is the result of the product of this number (164 121 721) by itself (i.e., 164 121 721 × 164 121 721); the square of 164 121 721 is sometimes called "raising 164 121 721 to the power 2", or "164 121 721 squared".
The square of 164 121 721 is 26 935 939 304 001 840 because 164 121 721 × 164 121 721 = 164 121 7212 = 26 935 939 304 001 840.
As a consequence, 164 121 721 is the square root of 26 935 939 304 001 840.
164 121 721 is a number with 9 digits.
The multiples of 164 121 721 are all integers evenly divisible by 164 121 721, that is all numbers such that the remainder of the division by 164 121 721 is zero. There are infinitely many multiples of 164 121 721. The smallest multiples of 164 121 721 are: