It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 263 is not a prime number.
For example, 998 263 can be divided by 7: 998 263 / 7 = 142 609.
For 998 263 to be a prime number, it would have been required that 998 263 has only two divisors, i.e., itself and 1.
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998 263 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 998 263 is about 999.131.
Thus, the square root of 998 263 is not an integer, and therefore 998 263 is not a square number.
The square of a number (here 998 263) is the result of the product of this number (998 263) by itself (i.e., 998 263 × 998 263); the square of 998 263 is sometimes called "raising 998 263 to the power 2", or "998 263 squared".
The square of 998 263 is 996 529 017 169 because 998 263 × 998 263 = 998 2632 = 996 529 017 169.
As a consequence, 998 263 is the square root of 996 529 017 169.
The multiples of 998 263 are all integers evenly divisible by 998 263, that is all numbers such that the remainder of the division by 998 263 is zero. There are infinitely many multiples of 998 263. The smallest multiples of 998 263 are: