It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 998 377 is not a prime number.
For example, 1 998 377 can be divided by 631: 1 998 377 / 631 = 3 167.
For 1 998 377 to be a prime number, it would have been required that 1 998 377 has only two divisors, i.e., itself and 1.
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1 998 377 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 1 998 377 is about 1 413.640.
Thus, the square root of 1 998 377 is not an integer, and therefore 1 998 377 is not a square number.
The square of a number (here 1 998 377) is the result of the product of this number (1 998 377) by itself (i.e., 1 998 377 × 1 998 377); the square of 1 998 377 is sometimes called "raising 1 998 377 to the power 2", or "1 998 377 squared".
The square of 1 998 377 is 3 993 510 634 129 because 1 998 377 × 1 998 377 = 1 998 3772 = 3 993 510 634 129.
As a consequence, 1 998 377 is the square root of 3 993 510 634 129.
The multiples of 1 998 377 are all integers evenly divisible by 1 998 377, that is all numbers such that the remainder of the division by 1 998 377 is zero. There are infinitely many multiples of 1 998 377. The smallest multiples of 1 998 377 are: