It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 137 988 is not a prime number.
For example, 137 988 can be divided by 2: 137 988 / 2 = 68 994.
For 137 988 to be a prime number, it would have been required that 137 988 has only two divisors, i.e., itself and 1.
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137 988 is an even number, because it is evenly divisible by 2: 137 988 / 2 = 68 994.
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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 137 988 is about 371.467.
Thus, the square root of 137 988 is not an integer, and therefore 137 988 is not a square number.
The square of a number (here 137 988) is the result of the product of this number (137 988) by itself (i.e., 137 988 × 137 988); the square of 137 988 is sometimes called "raising 137 988 to the power 2", or "137 988 squared".
The square of 137 988 is 19 040 688 144 because 137 988 × 137 988 = 137 9882 = 19 040 688 144.
As a consequence, 137 988 is the square root of 19 040 688 144.
The multiples of 137 988 are all integers evenly divisible by 137 988, that is all numbers such that the remainder of the division by 137 988 is zero. There are infinitely many multiples of 137 988. The smallest multiples of 137 988 are: