It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 165 139 is not a prime number.
For example, 165 139 can be divided by 13: 165 139 / 13 = 12 703.
For 165 139 to be a prime number, it would have been required that 165 139 has only two divisors, i.e., itself and 1.
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165 139 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 165 139 is about 406.373.
Thus, the square root of 165 139 is not an integer, and therefore 165 139 is not a square number.
The square of a number (here 165 139) is the result of the product of this number (165 139) by itself (i.e., 165 139 × 165 139); the square of 165 139 is sometimes called "raising 165 139 to the power 2", or "165 139 squared".
The square of 165 139 is 27 270 889 321 because 165 139 × 165 139 = 165 1392 = 27 270 889 321.
As a consequence, 165 139 is the square root of 27 270 889 321.
The multiples of 165 139 are all integers evenly divisible by 165 139, that is all numbers such that the remainder of the division by 165 139 is zero. There are infinitely many multiples of 165 139. The smallest multiples of 165 139 are: