It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 721 401 is not a prime number.
For example, 138 721 401 can be divided by 3: 138 721 401 / 3 = 46 240 467.
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For 138 721 401 to be a prime number, it would have been required that 138 721 401 has only two divisors, i.e., itself and 1.
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138 721 401 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 138 721 401 is about 11 778.005.
Thus, the square root of 138 721 401 is not an integer, and therefore 138 721 401 is not a square number.
The square of a number (here 138 721 401) is the result of the product of this number (138 721 401) by itself (i.e., 138 721 401 × 138 721 401); the square of 138 721 401 is sometimes called "raising 138 721 401 to the power 2", or "138 721 401 squared".
The square of 138 721 401 is 19 243 627 095 402 800 because 138 721 401 × 138 721 401 = 138 721 4012 = 19 243 627 095 402 800.
As a consequence, 138 721 401 is the square root of 19 243 627 095 402 800.
138 721 401 is a number with 9 digits.
The multiples of 138 721 401 are all integers evenly divisible by 138 721 401, that is all numbers such that the remainder of the division by 138 721 401 is zero. There are infinitely many multiples of 138 721 401. The smallest multiples of 138 721 401 are: