It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 125 121 is not a prime number.
For example, 125 121 can be divided by 3: 125 121 / 3 = 41 707.
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For 125 121 to be a prime number, it would have been required that 125 121 has only two divisors, i.e., itself and 1.
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125 121 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 125 121 is about 353.724.
Thus, the square root of 125 121 is not an integer, and therefore 125 121 is not a square number.
The square of a number (here 125 121) is the result of the product of this number (125 121) by itself (i.e., 125 121 × 125 121); the square of 125 121 is sometimes called "raising 125 121 to the power 2", or "125 121 squared".
The square of 125 121 is 15 655 264 641 because 125 121 × 125 121 = 125 1212 = 15 655 264 641.
As a consequence, 125 121 is the square root of 15 655 264 641.
The multiples of 125 121 are all integers evenly divisible by 125 121, that is all numbers such that the remainder of the division by 125 121 is zero. There are infinitely many multiples of 125 121. The smallest multiples of 125 121 are: