It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 425 998 is not a prime number.
For example, 138 425 998 can be divided by 2: 138 425 998 / 2 = 69 212 999.
For 138 425 998 to be a prime number, it would have been required that 138 425 998 has only two divisors, i.e., itself and 1.
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138 425 998 is an even number, because it is evenly divisible by 2: 138 425 998 / 2 = 69 212 999.
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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 138 425 998 is about 11 765.458.
Thus, the square root of 138 425 998 is not an integer, and therefore 138 425 998 is not a square number.
The square of a number (here 138 425 998) is the result of the product of this number (138 425 998) by itself (i.e., 138 425 998 × 138 425 998); the square of 138 425 998 is sometimes called "raising 138 425 998 to the power 2", or "138 425 998 squared".
The square of 138 425 998 is 19 161 756 922 296 004 because 138 425 998 × 138 425 998 = 138 425 9982 = 19 161 756 922 296 004.
As a consequence, 138 425 998 is the square root of 19 161 756 922 296 004.
138 425 998 is a number with 9 digits.
The multiples of 138 425 998 are all integers evenly divisible by 138 425 998, that is all numbers such that the remainder of the division by 138 425 998 is zero. There are infinitely many multiples of 138 425 998. The smallest multiples of 138 425 998 are: