It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 998 407 is not a prime number.
For example, 998 407 can be divided by 23: 998 407 / 23 = 43 409.
For 998 407 to be a prime number, it would have been required that 998 407 has only two divisors, i.e., itself and 1.
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998 407 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 998 407 is about 999.203.
Thus, the square root of 998 407 is not an integer, and therefore 998 407 is not a square number.
The square of a number (here 998 407) is the result of the product of this number (998 407) by itself (i.e., 998 407 × 998 407); the square of 998 407 is sometimes called "raising 998 407 to the power 2", or "998 407 squared".
The square of 998 407 is 996 816 537 649 because 998 407 × 998 407 = 998 4072 = 996 816 537 649.
As a consequence, 998 407 is the square root of 996 816 537 649.
The multiples of 998 407 are all integers evenly divisible by 998 407, that is all numbers such that the remainder of the division by 998 407 is zero. There are infinitely many multiples of 998 407. The smallest multiples of 998 407 are: