It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 138 722 is not a prime number.
For example, 138 722 can be divided by 2: 138 722 / 2 = 69 361.
For 138 722 to be a prime number, it would have been required that 138 722 has only two divisors, i.e., itself and 1.
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138 722 is an even number, because it is evenly divisible by 2: 138 722 / 2 = 69 361.
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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 138 722 is about 372.454.
Thus, the square root of 138 722 is not an integer, and therefore 138 722 is not a square number.
The square of a number (here 138 722) is the result of the product of this number (138 722) by itself (i.e., 138 722 × 138 722); the square of 138 722 is sometimes called "raising 138 722 to the power 2", or "138 722 squared".
The square of 138 722 is 19 243 793 284 because 138 722 × 138 722 = 138 7222 = 19 243 793 284.
As a consequence, 138 722 is the square root of 19 243 793 284.
The multiples of 138 722 are all integers evenly divisible by 138 722, that is all numbers such that the remainder of the division by 138 722 is zero. There are infinitely many multiples of 138 722. The smallest multiples of 138 722 are: