Why does this code only print true when i = 4, 9, 25, or 49?

Question

def is_prime(x):
IsPrime = True
if x <= 1:
IsPrime = False
for i in range(2,x):
if x % i == 0:
IsPrime = False
if IsPrime == False:
return(False)
else:
return(True)

def primes_range(x):
return([i for i in range(x + 1) if is_prime(i) == True])

def facts(x):
lst = []
for i in range(1,x + 1):
for j in range(1,x + 1):
if x / i == j:
lst.append(i)
return lst

def prime_facts(x):
b = primes_range(x)
c = facts(x)
d = [i for i in c if i in b]
return(d)

def is_semiprime(x):
b = prime_facts(x)
for i in b:
for j in b:
if i * j == x:
return(True)
else:
return(False)

for i in range(100):
print(i, is_semiprime(i))

Answer 1

def facts(x):
lst = []
for i in range(1,x + 1):
if x%i == 0:
lst.append(i)
return lst

def is_semiprime(x):
b = prime_facts(x)
for i in b:
for j in b:
if i * j == x:
return True
return False

P.S. This is one of my challenges, so tag me when you post your code.