It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 139 243 is not a prime number.
For example, 139 243 can be divided by 13: 139 243 / 13 = 10 711.
For 139 243 to be a prime number, it would have been required that 139 243 has only two divisors, i.e., itself and 1.
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139 243 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 139 243 is about 373.153.
Thus, the square root of 139 243 is not an integer, and therefore 139 243 is not a square number.
The square of a number (here 139 243) is the result of the product of this number (139 243) by itself (i.e., 139 243 × 139 243); the square of 139 243 is sometimes called "raising 139 243 to the power 2", or "139 243 squared".
The square of 139 243 is 19 388 613 049 because 139 243 × 139 243 = 139 2432 = 19 388 613 049.
As a consequence, 139 243 is the square root of 19 388 613 049.
The multiples of 139 243 are all integers evenly divisible by 139 243, that is all numbers such that the remainder of the division by 139 243 is zero. There are infinitely many multiples of 139 243. The smallest multiples of 139 243 are: