It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 777 788 is not a prime number.
For example, 138 777 788 can be divided by 2: 138 777 788 / 2 = 69 388 894.
For 138 777 788 to be a prime number, it would have been required that 138 777 788 has only two divisors, i.e., itself and 1.
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138 777 788 is an even number, because it is evenly divisible by 2: 138 777 788 / 2 = 69 388 894.
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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 138 777 788 is about 11 780.398.
Thus, the square root of 138 777 788 is not an integer, and therefore 138 777 788 is not a square number.
The square of a number (here 138 777 788) is the result of the product of this number (138 777 788) by itself (i.e., 138 777 788 × 138 777 788); the square of 138 777 788 is sometimes called "raising 138 777 788 to the power 2", or "138 777 788 squared".
The square of 138 777 788 is 19 259 274 442 172 944 because 138 777 788 × 138 777 788 = 138 777 7882 = 19 259 274 442 172 944.
As a consequence, 138 777 788 is the square root of 19 259 274 442 172 944.
138 777 788 is a number with 9 digits.
The multiples of 138 777 788 are all integers evenly divisible by 138 777 788, that is all numbers such that the remainder of the division by 138 777 788 is zero. There are infinitely many multiples of 138 777 788. The smallest multiples of 138 777 788 are: