It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 191 is not a prime number.
For example, 998 191 can be divided by 421: 998 191 / 421 = 2 371.
For 998 191 to be a prime number, it would have been required that 998 191 has only two divisors, i.e., itself and 1.
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998 191 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 998 191 is about 999.095.
Thus, the square root of 998 191 is not an integer, and therefore 998 191 is not a square number.
The square of a number (here 998 191) is the result of the product of this number (998 191) by itself (i.e., 998 191 × 998 191); the square of 998 191 is sometimes called "raising 998 191 to the power 2", or "998 191 squared".
The square of 998 191 is 996 385 272 481 because 998 191 × 998 191 = 998 1912 = 996 385 272 481.
As a consequence, 998 191 is the square root of 996 385 272 481.
The multiples of 998 191 are all integers evenly divisible by 998 191, that is all numbers such that the remainder of the division by 998 191 is zero. There are infinitely many multiples of 998 191. The smallest multiples of 998 191 are: