It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 135 988 is not a prime number.
For example, 135 988 can be divided by 2: 135 988 / 2 = 67 994.
For 135 988 to be a prime number, it would have been required that 135 988 has only two divisors, i.e., itself and 1.
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135 988 is an even number, because it is evenly divisible by 2: 135 988 / 2 = 67 994.
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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 135 988 is about 368.766.
Thus, the square root of 135 988 is not an integer, and therefore 135 988 is not a square number.
The square of a number (here 135 988) is the result of the product of this number (135 988) by itself (i.e., 135 988 × 135 988); the square of 135 988 is sometimes called "raising 135 988 to the power 2", or "135 988 squared".
The square of 135 988 is 18 492 736 144 because 135 988 × 135 988 = 135 9882 = 18 492 736 144.
As a consequence, 135 988 is the square root of 18 492 736 144.
The multiples of 135 988 are all integers evenly divisible by 135 988, that is all numbers such that the remainder of the division by 135 988 is zero. There are infinitely many multiples of 135 988. The smallest multiples of 135 988 are: