It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 902 is not a prime number.
For example, 138 902 can be divided by 2: 138 902 / 2 = 69 451.
For 138 902 to be a prime number, it would have been required that 138 902 has only two divisors, i.e., itself and 1.
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138 902 is an even number, because it is evenly divisible by 2: 138 902 / 2 = 69 451.
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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 138 902 is about 372.696.
Thus, the square root of 138 902 is not an integer, and therefore 138 902 is not a square number.
The square of a number (here 138 902) is the result of the product of this number (138 902) by itself (i.e., 138 902 × 138 902); the square of 138 902 is sometimes called "raising 138 902 to the power 2", or "138 902 squared".
The square of 138 902 is 19 293 765 604 because 138 902 × 138 902 = 138 9022 = 19 293 765 604.
As a consequence, 138 902 is the square root of 19 293 765 604.
The multiples of 138 902 are all integers evenly divisible by 138 902, that is all numbers such that the remainder of the division by 138 902 is zero. There are infinitely many multiples of 138 902. The smallest multiples of 138 902 are: