It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 138 139 is not a prime number.
For example, 998 138 139 can be divided by 3: 998 138 139 / 3 = 332 712 713.
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For 998 138 139 to be a prime number, it would have been required that 998 138 139 has only two divisors, i.e., itself and 1.
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998 138 139 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 998 138 139 is about 31 593.324.
Thus, the square root of 998 138 139 is not an integer, and therefore 998 138 139 is not a square number.
The square of a number (here 998 138 139) is the result of the product of this number (998 138 139) by itself (i.e., 998 138 139 × 998 138 139); the square of 998 138 139 is sometimes called "raising 998 138 139 to the power 2", or "998 138 139 squared".
The square of 998 138 139 is 996 279 744 526 383 360 because 998 138 139 × 998 138 139 = 998 138 1392 = 996 279 744 526 383 360.
As a consequence, 998 138 139 is the square root of 996 279 744 526 383 360.
998 138 139 is a number with 9 digits.
The multiples of 998 138 139 are all integers evenly divisible by 998 138 139, that is all numbers such that the remainder of the division by 998 138 139 is zero. There are infinitely many multiples of 998 138 139. The smallest multiples of 998 138 139 are: