It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 198 742 is not a prime number.
For example, 198 742 can be divided by 2: 198 742 / 2 = 99 371.
For 198 742 to be a prime number, it would have been required that 198 742 has only two divisors, i.e., itself and 1.
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198 742 is an even number, because it is evenly divisible by 2: 198 742 / 2 = 99 371.
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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 198 742 is about 445.805.
Thus, the square root of 198 742 is not an integer, and therefore 198 742 is not a square number.
The square of a number (here 198 742) is the result of the product of this number (198 742) by itself (i.e., 198 742 × 198 742); the square of 198 742 is sometimes called "raising 198 742 to the power 2", or "198 742 squared".
The square of 198 742 is 39 498 382 564 because 198 742 × 198 742 = 198 7422 = 39 498 382 564.
As a consequence, 198 742 is the square root of 39 498 382 564.
The multiples of 198 742 are all integers evenly divisible by 198 742, that is all numbers such that the remainder of the division by 198 742 is zero. There are infinitely many multiples of 198 742. The smallest multiples of 198 742 are: