It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 129 138 is not a prime number.
For example, 129 138 can be divided by 2: 129 138 / 2 = 64 569.
For 129 138 to be a prime number, it would have been required that 129 138 has only two divisors, i.e., itself and 1.
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129 138 is an even number, because it is evenly divisible by 2: 129 138 / 2 = 64 569.
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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 129 138 is about 359.358.
Thus, the square root of 129 138 is not an integer, and therefore 129 138 is not a square number.
The square of a number (here 129 138) is the result of the product of this number (129 138) by itself (i.e., 129 138 × 129 138); the square of 129 138 is sometimes called "raising 129 138 to the power 2", or "129 138 squared".
The square of 129 138 is 16 676 623 044 because 129 138 × 129 138 = 129 1382 = 16 676 623 044.
As a consequence, 129 138 is the square root of 16 676 623 044.
The multiples of 129 138 are all integers evenly divisible by 129 138, that is all numbers such that the remainder of the division by 129 138 is zero. There are infinitely many multiples of 129 138. The smallest multiples of 129 138 are: