It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 128 129 is not a prime number.
For example, 128 129 can be divided by 17: 128 129 / 17 = 7 537.
For 128 129 to be a prime number, it would have been required that 128 129 has only two divisors, i.e., itself and 1.
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128 129 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 128 129 is about 357.951.
Thus, the square root of 128 129 is not an integer, and therefore 128 129 is not a square number.
The square of a number (here 128 129) is the result of the product of this number (128 129) by itself (i.e., 128 129 × 128 129); the square of 128 129 is sometimes called "raising 128 129 to the power 2", or "128 129 squared".
The square of 128 129 is 16 417 040 641 because 128 129 × 128 129 = 128 1292 = 16 417 040 641.
As a consequence, 128 129 is the square root of 16 417 040 641.
The multiples of 128 129 are all integers evenly divisible by 128 129, that is all numbers such that the remainder of the division by 128 129 is zero. There are infinitely many multiples of 128 129. The smallest multiples of 128 129 are: