It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 702 is not a prime number.
For example, 138 702 can be divided by 2: 138 702 / 2 = 69 351.
For 138 702 to be a prime number, it would have been required that 138 702 has only two divisors, i.e., itself and 1.
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138 702 is an even number, because it is evenly divisible by 2: 138 702 / 2 = 69 351.
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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 138 702 is about 372.427.
Thus, the square root of 138 702 is not an integer, and therefore 138 702 is not a square number.
The square of a number (here 138 702) is the result of the product of this number (138 702) by itself (i.e., 138 702 × 138 702); the square of 138 702 is sometimes called "raising 138 702 to the power 2", or "138 702 squared".
The square of 138 702 is 19 238 244 804 because 138 702 × 138 702 = 138 7022 = 19 238 244 804.
As a consequence, 138 702 is the square root of 19 238 244 804.
The multiples of 138 702 are all integers evenly divisible by 138 702, that is all numbers such that the remainder of the division by 138 702 is zero. There are infinitely many multiples of 138 702. The smallest multiples of 138 702 are: