It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 198 121 is not a prime number.
For example, 198 121 can be divided by 7: 198 121 / 7 = 28 303.
For 198 121 to be a prime number, it would have been required that 198 121 has only two divisors, i.e., itself and 1.
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198 121 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 198 121 is about 445.108.
Thus, the square root of 198 121 is not an integer, and therefore 198 121 is not a square number.
The square of a number (here 198 121) is the result of the product of this number (198 121) by itself (i.e., 198 121 × 198 121); the square of 198 121 is sometimes called "raising 198 121 to the power 2", or "198 121 squared".
The square of 198 121 is 39 251 930 641 because 198 121 × 198 121 = 198 1212 = 39 251 930 641.
As a consequence, 198 121 is the square root of 39 251 930 641.
The multiples of 198 121 are all integers evenly divisible by 198 121, that is all numbers such that the remainder of the division by 198 121 is zero. There are infinitely many multiples of 198 121. The smallest multiples of 198 121 are: