It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 236 is not a prime number.
For example, 138 236 can be divided by 2: 138 236 / 2 = 69 118.
For 138 236 to be a prime number, it would have been required that 138 236 has only two divisors, i.e., itself and 1.
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138 236 is an even number, because it is evenly divisible by 2: 138 236 / 2 = 69 118.
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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 138 236 is about 371.801.
Thus, the square root of 138 236 is not an integer, and therefore 138 236 is not a square number.
The square of a number (here 138 236) is the result of the product of this number (138 236) by itself (i.e., 138 236 × 138 236); the square of 138 236 is sometimes called "raising 138 236 to the power 2", or "138 236 squared".
The square of 138 236 is 19 109 191 696 because 138 236 × 138 236 = 138 2362 = 19 109 191 696.
As a consequence, 138 236 is the square root of 19 109 191 696.
The multiples of 138 236 are all integers evenly divisible by 138 236, that is all numbers such that the remainder of the division by 138 236 is zero. There are infinitely many multiples of 138 236. The smallest multiples of 138 236 are: