It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 137 998 is not a prime number.
For example, 137 998 can be divided by 2: 137 998 / 2 = 68 999.
For 137 998 to be a prime number, it would have been required that 137 998 has only two divisors, i.e., itself and 1.
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137 998 is an even number, because it is evenly divisible by 2: 137 998 / 2 = 68 999.
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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 137 998 is about 371.481.
Thus, the square root of 137 998 is not an integer, and therefore 137 998 is not a square number.
The square of a number (here 137 998) is the result of the product of this number (137 998) by itself (i.e., 137 998 × 137 998); the square of 137 998 is sometimes called "raising 137 998 to the power 2", or "137 998 squared".
The square of 137 998 is 19 043 448 004 because 137 998 × 137 998 = 137 9982 = 19 043 448 004.
As a consequence, 137 998 is the square root of 19 043 448 004.
The multiples of 137 998 are all integers evenly divisible by 137 998, that is all numbers such that the remainder of the division by 137 998 is zero. There are infinitely many multiples of 137 998. The smallest multiples of 137 998 are: