It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 408 is not a prime number.
For example, 998 408 can be divided by 2: 998 408 / 2 = 499 204.
For 998 408 to be a prime number, it would have been required that 998 408 has only two divisors, i.e., itself and 1.
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998 408 is an even number, because it is evenly divisible by 2: 998 408 / 2 = 499 204.
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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 998 408 is about 999.204.
Thus, the square root of 998 408 is not an integer, and therefore 998 408 is not a square number.
The square of a number (here 998 408) is the result of the product of this number (998 408) by itself (i.e., 998 408 × 998 408); the square of 998 408 is sometimes called "raising 998 408 to the power 2", or "998 408 squared".
The square of 998 408 is 996 818 534 464 because 998 408 × 998 408 = 998 4082 = 996 818 534 464.
As a consequence, 998 408 is the square root of 996 818 534 464.
The multiples of 998 408 are all integers evenly divisible by 998 408, that is all numbers such that the remainder of the division by 998 408 is zero. There are infinitely many multiples of 998 408. The smallest multiples of 998 408 are: