Answer:
Here is a MARIE assembly program that accepts an integer from the user and determines if it is a prime number or not. It uses a simple algorithm to check for divisibility by numbers from 2 to the square root of the input number.
```
ORG 100
Input, 0
Store X // Store the input number
Load X
Subt Two // Subtract 2 from the input number
Skipcond 400 // Skip next instruction if the result is negative (i.e., input is less than 2)
Jump NotPrime // Jump to NotPrime if the input number is less than 2
Load X
Store Dividend // Store the input number as the dividend
Load Dividend
Div Two // Divide the dividend by 2
Store Quotient // Store the quotient
Load Dividend
Subt Quotient // Subtract the quotient from the dividend
Skipcond 400 // Skip next instruction if the result is not zero (i.e., input is divisible by 2)
Jump NotPrime // Jump to NotPrime if the input number is divisible by 2
Load Dividend
Subt One // Subtract 1 from the dividend
Load Dividend
Store Divisor // Store the divisor
Loop, Load Divisor
Muli Divisor // Multiply the divisor by itself
Skipcond 400 // Skip next instruction if the result is greater than the dividend (i.e., divisor squared is greater than the dividend)
Jump NotPrime // Jump to NotPrime if the input number is divisible by any number up to its square root
Load Divisor
Add One // Increment the divisor
Store Divisor // Store the updated divisor
Jump Loop // Repeat the loop until the divisor exceeds the square root of the dividend
Load One // Load 1 (indicating prime)
Output
Jump End
NotPrime, Load Zero // Load 0 (indicating not prime)
Output
End, Halt
Two, DEC 2
One, DEC 1
Zero, DEC 0
Dividend, DEC 0
Divisor, DEC 0
Quotient, DEC 0
END
```
This program uses the variables Dividend, Divisor, and Quotient for intermediate calculations. It checks divisibility starting from 2 and goes up to the square root of the input number. If the input number is divisible by any of these numbers, it jumps to the NotPrime section and outputs 0. Otherwise, it outputs 1 at the end, indicating that the input number is prime.
Step-by-step explanation: