It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 162 138 is not a prime number.
For example, 162 138 can be divided by 2: 162 138 / 2 = 81 069.
For 162 138 to be a prime number, it would have been required that 162 138 has only two divisors, i.e., itself and 1.
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162 138 is an even number, because it is evenly divisible by 2: 162 138 / 2 = 81 069.
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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 162 138 is about 402.664.
Thus, the square root of 162 138 is not an integer, and therefore 162 138 is not a square number.
The square of a number (here 162 138) is the result of the product of this number (162 138) by itself (i.e., 162 138 × 162 138); the square of 162 138 is sometimes called "raising 162 138 to the power 2", or "162 138 squared".
The square of 162 138 is 26 288 731 044 because 162 138 × 162 138 = 162 1382 = 26 288 731 044.
As a consequence, 162 138 is the square root of 26 288 731 044.
The multiples of 162 138 are all integers evenly divisible by 162 138, that is all numbers such that the remainder of the division by 162 138 is zero. There are infinitely many multiples of 162 138. The smallest multiples of 162 138 are: